Re-closure Tape Application on Packaging Machine

ABSTRACT

A tape closure system is shown and described herein. The tape closure system includes a first tape component having a pressure sensitive adhesive and a second tape component having a pressure sensitive adhesive, where at least one of the pressure sensitive adhesives has a modified surface to reduce the tack of the surface such that when the first and second pressure adhesives are brought into contact with one another they may sufficiently adhere to one another to form a seal but are still separable from one another and able to be repeatedly opened and sealed. Such a tape may be manufactured through high speed manufacturing processes and wound into large master rolls. In the roll configuration, the modified surface contacts the backside of the liner and experiences compressive forces in the roll. Due to the compressive forces, a part of the modified surface may get pushed into the PSA, thereby affecting the properties of the modified adhesive. An embodiment of this invention provides an embossed liner with spacers that nest the modified adhesive surface when it is self-wound, thereby preventing the deterioration of the adhesive properties. An embodiment of the invention is a method by which the adhesive-based closure system can be applied on to a flexible packaging material on a Form Fill Seal packaging machine in one of three ways: (1) In a form of a tape from a spool. (2) In a form of an adhesive dispensed directly on to flexible packaging material. (3) In form of a tape dispensed from a roll of pressure sensitive adhesive roll. Another embodiment of the invention is a double sided tape with the detack layer on both sides. An embodiment of the present invention can also be used for temporary closure with no damage done to the underlying system.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. patent applicationSer. No. 16/155,886 filed Oct. 9, 2018 which is pending, and claimspriority to and the benefit of U.S. Provisional Application 62/741,071filed on Oct. 4, 2018, U.S. Provisional Application 62/570,266 filed onOct. 10, 2017, U.S. Provisional Application 62/571,506 filed on Oct. 12,2017, U.S. Provisional Application 62/584,358 filed on Nov. 10, 2017,and is continuation-in-part of U.S. patent application Ser. No.15/680,900 filed on Aug. 18, 2017 now U.S. Pat. No. 10,196,544 issuedFeb. 5, 2019, which claims priority to and the benefit of U.S.Provisional Application 62/478,312 filed on Mar. 29, 2017, the entiredisclosures of the above-listed applications are incorporated herein byreference in their entirety.

FIELD OF INVENTION

The present invention relates to a two-part adhesive-based closuresystem which allows both ease of closure without careful alignment ofthe components and the ability to open and reclose many times. Thesystem includes a pressure sensitive adhesive surface having a modifiedsurface topography to provide a surface having a relatively low tack ornon-tacky surface. The pressure sensitive adhesive of at least oneadhesive is provided with a surface having a low or non-tacky surfacesuch that when it is brought together with another adhesive surface(e.g., of a second tape) it can adhere to and form a seal with the otheradhesive surface, but such that the adhesive surfaces may be easilyseparated from one another. Such a system provides a resealable closuresystem for a variety of packages. Further the design limits fouling ofthe sealing area by contaminants which may contact said area. Such atape may be manufactured through high speed manufacturing processes andwound into large master rolls. In the roll configuration, the modifiedsurface contacts the backside of the liner and experiences compressiveforces in the roll. Due to the compressive forces, a part of themodified surface may get pushed into the PSA, thereby affecting theproperties of the modified adhesive. An embodiment of this inventionprovides an embossed liner with spacers that nest the modified adhesivesurface when it is self-wound, thereby preventing the deterioration ofthe adhesive properties. Another embodiment of the invention is a methodby which the adhesive-based closure system can be applied on to aflexible packaging material on a Form Fill Seal packaging machine in atleast one of three ways: (1) In a form of a tape from a spool. (2) In aform of an adhesive dispensed directly on to flexible packagingmaterial. (3) In form of a tape dispensed from a roll of pressuresensitive adhesive roll. The invention also describes a double-sidedtape with the detack layer on both sides. Another embodiment of thepresent invention can also be used for temporary closure with no damagedone to the underlying system.

BACKGROUND

Closure systems for packaging, e.g., food packaging, may be categorizedinto three general categories: (i) cohesives, (ii) pressure sensitiveadhesive based closures, and (iii) mechanical closures. A cohesive is aclass of material that has no tack or adhesion except to itself anexample of a cohesive system is illustrated in U.S. Pat. No. 6,076,969.These materials are often used to attach and form secure closures infood packaging such as, for example, in candy bars. These closures areessentially “one use” closure systems that are not suitable forrepeatedly opening and closing the package.

Many packages are provided with a closure system to allow for repeatedopening and resealing of the package to protect the contents inside thepackage. Pressure sensitive adhesive-based closures and mechanicalclosures may be employed for such applications. Pressure sensitiveadhesive systems have been provided as detackified adhesives where theintrinsic properties of the adhesive are manipulated to reduce the tackand peel adhesion (see, e.g., U.S. Pat. No. 5,346,766). For example, themodulus of the adhesive may be adjusted to reduce the initial tack andpeel adhesion. In these types of adhesives, adhesion builds over time asthe adhesive flows and recovers its intrinsic properties.

Pressure sensitive based closures are based on simple PSA tapes attachedto one of the side package adhering to the substrate on the other side.In some of those cases, an adhesive is modified with an additive such asa cluster of particles, powders or talc on the surface to alter theinitial tack and peel properties of the adhesive. There are cases of PSAsystems wherein the surface is modified with glass particles such as inU.S. Pat. No. 5,141,790. Although such tapes or laminates are not usedin food closure and packaging applications, in these systems, pressureis used to press in on the additive, e.g., the glass particles, to embedthem into the adhesive bulk and the adhesion builds rapidly. A number ofpatents such as U.S. Pat. Nos. 4,376,151, 4,556,595, 3,331,279, and3,314,838 all fall within this category to limit the initial adhesionand then activate the adhesion to a substrate by pressing down withpressure. These kinds of PSA laminates are used for industrial graphicsapplications such as the decoration of sides of trucks, etc. where theslidability of these large graphics on substrates is needed. A number ofother patents, such as U.S. Pat. Nos. 6,541,098 and 5,871,607, deal withmodification of the surface of a highly conformable film or substratewith a topology of upraised non-tacky regions and valleys with adhesive.These structures provide the non-tacky feel to the finger as it slidesalong the upraised non-tacky regions. On applying pressure, the fingerthen contacts the adhesives in the valleys building adhesion. These havebeen used for applications such as Glad Press n Seal.

In the afore mentioned adhesives, the adhesives are applied to onesurface of the package and are suitable for adhering to another surfaceof the package that is free of any adhesive.

Mechanical systems include such items as Velcro, “zipper” systems, hookand loop, slider systems, “mushroom” type closures, and variousmale/female closure systems, etc., and are commonly used on packages toallow for opening and resealing or closing the package. Examples of suchsystems are illustrated in U.S. Pat. No. 7,857,515 (hook and loop), U.S.Pat. No. 7,736,058 (mushroom type), U.S. Pat. Nos. 7,316,052, 7,340,807,and U.S. Patent Publication No. 2011/0171430 (male/female closuresystems). Such systems require careful alignment of the components toclose the package correctly. Additionally, such systems arethree-dimensional in character and add to the surface profile of thepackage. Mechanical systems are also typically expensive and difficultto manufacture and apply for certain types of packages.

SUMMARY

The following presents a summary of this disclosure to provide a basicunderstanding of some aspects. This summary is intended to neitheridentify key or critical elements nor define any limitations ofembodiments or claims. Furthermore, this summary may provide asimplified overview of some aspects that may be described in greaterdetail in other portions of this disclosure.

In accordance with one aspect, provided is an adhesive closure systemhaving a reduced tack to allow for sealing and unsealing a packagenumerous times. The adhesive closure system includes a first adhesivesurface and a second adhesive surface configured to engage the firstadhesive surface. At least one of the adhesive surfaces is provided suchthat it has a reduced tack. In some embodiments, both the first adhesivesurface and the second adhesive surface are modified to have a reducedtack. The first and second adhesives are configured to mate with oneanother, where the reduced tack adhesive surface(s) allow for adequatesealing but still permit relatively easy separation of the surfaces.

In one aspect, provided is a tape-based closure system comprising afirst tape having a first pressure sensitive adhesive surface and asecond tape having a second pressure sensitive adhesive surface, whereinat least one of the first or second pressure sensitive adhesive surfacesis modified with an additive such that the pressure sensitive adhesivesurface has a reduced tack.

This closure system is a low-cost alternate to zippers, sliders, Velcro,and other such closure systems for items that require repeated and easyclosing and opening without careful alignment. Such an adhesive tapesystem is achieved through modifying the topology of one or both of thepressure-sensitive adhesive surfaces through a non-tacky additive suchas ink, filler, or other polymeric or non-polymeric material whichprotrudes from one or both surfaces of the adhesive. The additivemodifies the surface to make it low or non-tacky to touch and slideableto the finger. The modifiers can also prevent contamination of theadhesive such as by preventing adhesion of foreign substances, such asfood stuffs or contents of a package, to the adhesive surface. Suchcontamination could limit or minimize the adhesion of the adhesivesurfaces to one another, which might reduce the number of times theclosure system can be opened and resealed. The additive may be randomlyor uniformly distributed on one or both surfaces of the adhesive. Whenthe two surfaces are brought together and pressed, the tacky parts inthe valleys of one surface contact the hills or the smooth part on theadjacent surface forming a bond. The bond strength may be controlled byvarious factors including, for example, adhesive coat weight, amount ofadditive on the surfaces, the surface coverage of the additive, theheight, size and modulus of the additive, contact area between the twosurfaces, force applied to close, and the time of contact. The bondstrength may be tailored to be low enough to open easily but high enoughto form a good and generally continuous seal.

In one aspect, provided is an adhesive closure system comprising: afirst pressure sensitive adhesive having an upper adhesive surface; anda second pressure sensitive adhesive having an upper adhesive surface,wherein the adhesive surfaces of the first and second pressure sensitiveadhesives can be repeatedly attached and detached to one another to forma closure, and the adhesive surface of (i) the first pressure sensitiveadhesive, (ii) the second pressure sensitive adhesive, or (iii) both thefirst pressure sensitive adhesive and the second pressure sensitiveadhesive comprise a plurality of standoffs defining a modified surfacetopography.

In one or more embodiments, the adhesive closure system may include anyof the following features separately or in combination with one another:

-   -   Each of the first pressure sensitive adhesive and the second        pressure sensitive adhesive has a modified surfacetopography.    -   The standoffs (or projections or protrusions) are provided by a        filler admixed with the pressure sensitive adhesive.    -   The standoffs are provided by a material applied to the surface        of the pressure sensitive adhesive.    -   The standoffs are formed from an ink, an elastomeric material,        or a polymeric material or an inorganic material.    -   The standoffs are formed from a hot melt elastomer, an emulsion        elastomer, or a combination thereof.    -   The standoffs are provided as discrete, regular shapes.    -   The standoffs are provided in a regular pattern.    -   The standoffs are provided in a random arrangement.    -   The standoffs are provided as elongated lines, fibrils, or        filaments.    -   The standoffs in the shape of elongated lines, fibrils, or        filaments are disposed in a random array.    -   The standoffs are provided by elongated lines, fibrils, or        filaments of different lengths and/or thicknesses disposed in a        random array.    -   At least two of the plurality of standoffs on a given adhesive        partially overlap with one another.    -   The standoffs cover from about 5% to about 60% of the surface        area of the adhesive surface; from about 10% to about 50%; from        about 15% to about 45%; or from about 20% to about 30% of the        total surface area of the pressure sensitive adhesive surface.    -   The system has a T Peel value of from about 0.2 N/inch to about        20 N/inch; from about 0.5 N/inch to about 10 N/inch; from about        1 about 5 N/inch; or from about 2 to about 4 N/inch.    -   The system has a T Peel value of at least 0.5 N/inch or higher        after 10 reclosures.    -   The system has a T Peel value of 0.5 N/inch to 15 N/inch; from 1        N/inch to 10 N/inch, or from 2 N/inch to 4 N/inch after 10        reclosures.    -   The height of the standoff is from about 2 μm to about 500 μm;        from about 10 μm to about 300 μm; from about 25 μm to about 250        μm; from about 50 μm to about 150 μm; even from about 30 μm to        about 100 μm.    -   The standoffs may have a diameter or thickness of from about 5        μm to about 500 μm; from about 10 μm to about 250 μm; from about        25 μm to about 150 μm; even from about 30 μm to about 100 μm.    -   The coat weight of the standoffs is in the range of from about 2        grams/m² (gsm) to about 40 gsm; from about 5 gsm to about 30        gsm; even from about 2 to about 25 gsm.    -   The first pressure sensitive adhesive and the second pressure        sensitive adhesive are provided as a tape.

In one aspect, provided is a package having a first surface and a secondsurface adapted to be releasably joined together, the article comprisingan adhesive closure system according to any of the previous embodiments.

In one aspect, provided is a tape comprising a facestock or carrierfilm, a first adhesive disposed on a lower surface of the facestock orcarrier film, and a second adhesive disposed on the upper surface of thefacestock or carrier film, the second adhesive being a pressuresensitive adhesive having a plurality of standoffs defining a modifiedsurface topography. In one embodiment, the tape is disposed on a linersuch that the first adhesive is adjacent to the liner. The liner is afilm or paper which is coated on one or both sides with a silicone orother release material from which the adhesives can be easily removed.The tape may be provided as a roll in wound form by winding the tapeonto itself so the second adhesive contacts a surface of the linerduring storage. The tape may be provided such that:

-   -   The standoffs are provided by a filler admixed with the pressure        sensitive adhesive.    -   The standoffs are provided by a material applied to the surface        of the pressure sensitive adhesive.    -   The standoffs are formed from an ink, an elastomeric material, a        polymeric material or an inorganic material.    -   The standoffs are formed from a hot melt elastomer, an emulsion        elastomer, an inorganic material or a combination thereof.    -   The standoffs are provided as discrete, regular shapes.    -   The standoffs are provided in a regular pattern.    -   The standoffs are provided in a random arrangement.    -   The standoffs are provided as elongated lines or continuous or        discontinuous filaments.    -   The standoffs in the shape of elongated lines are disposed in a        random array.    -   The standoffs are provided by elongated lines, fibrils, or        filaments of different lengths and/or thicknesses disposed in a        random array.    -   At least two of the plurality of standoffs on a given adhesive        partially overlap with one another.    -   The standoffs cover from about 5% to about 60% of the surface        area of the adhesive surface; from about 10% to about 50%; from        about 15% to about 45%; even from about 20% to about 40% of the        total surface area of the pressure sensitive adhesive surface.    -   The system has a T Peel value of from about 0.2 N/inch to about        20 N/inch; from about 0.5 N/inch to about 10 N/inch; from about        1 N/inch to about 5 N/inch; even from about 2 N/inch to about 4        N/inch.    -   The system has a T Peel value of at least 0.5 N/inch or higher        after 10 reclosures.    -   The system has a T Peel value of 0.5 N/inch to 15 N/inch; from 1        N/inch to 10 N/inch, or from 2 N/inch to 4 N/inch after 10        reclosures.    -   The height of the standoff is from about 2 m to about 500 μm;        from about 10 μm to about 300 μm; from about 25 μm to about 250        μm; from about 50 μm to about 150 μm; even from about 75 μm to        about 100 μm.    -   The standoffs may have a diameter or thickness of from about 5        μm to about 500 μm; from about 10 μm to about 250 μm; from about        25 μm to about 150 μm; even from about 50 μm to about 100 μm.    -   The coat weight of the standoffs is in the range of from about 2        gsm to about 40 gsm; from about 5 gsm to about 30 gsm; even from        about 10 to about 25 gsm; or about 2 to about 25 gsm.

In one embodiment of the invention, a liner is provided which isembossable at least on one side whereby the embossed side of the linercomes in contact with the modified adhesive surface. By providing theserecesses of about 5 to 95 microns, the standoffs are nested in theserecesses and the standoff configuration is not altered by thecompressive pressures that are otherwise experienced by the entireadhesive surface in the roll form. Embossing of such a liner providesrecesses and spacers, and these spacers end up as the load bearers whilethe recesses act as the nests to prevent the deformation of the modifiedadhesive surface. Spacers are raised portions that provide a recessbetween the spacers to nest the standoffs, e.g., filaments deposited onthe top surface of the PSA layer. In one embodiment, spacers are formedby embossing of the liner. In another embodiment, the spacers are formedby extrusion during the manufacture of the film followed by releasecoating to form the liner. In yet another embodiment, the spacers areformed by printing, spraying or dusting material on the film or paperfollowed by release coating to form the liner.

An embodiment of the invention is a method by which the adhesive-basedclosure system can be applied on to a flexible packaging material on aForm Fill Seal packaging machine in at least one of three ways: (1) In aform of a tape from a spool. (2) In a form of an adhesive dispenseddirectly on to flexible packaging material. (3) In form of a tapedispensed from a roll of pressure sensitive adhesive roll. In the firstcase (adhesive tape on the spool), the adhesive based closure system isremoved from the release liner on a peeling plate and is subsequentlyapplied to the flexible packaging material prior to the forming collarin the transverse direction. In the second case (direct adhesivedispensing), the adhesive and detack layers are directly dispensed on tothe flexible packaging material using an adhesive/polymer dispensingunit. In the third case (adhesive tape from roll of adhesive tapematerial), the tape is either pre-cut to shape on the roll or, it is cutin situ on the roll material and is subsequently dispensed in transversedirection on to the flexible packaging material. Another embodiment ofthe invention is a double sided tape with the detack layer on bothsides. An embodiment of the present invention can also be used fortemporary closure with no damage done to the underlying system.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings illustrate various systems, apparatuses,devices and related methods, in which like reference characters refer tolike parts throughout, and in which:

FIG. 1 is a cross-sectional view of a tape closure system in accordancewith an embodiment;

FIG. 2a is a perspective, partial exploded view of a tape in accordancewith an embodiment of the invention;

FIG. 2b is a cross-sectional view of the tape closure system of FIG. 2a:

FIG. 3a is a cross-sectional view of a tape closure system in accordancewith an embodiment showing details related to the modified surface;

FIG. 3b is a cross-sectional view of the tape closure system of FIG. 3ain a closed configuration;

FIG. 4 is a plan view of a vertical form fill and seal system;

FIGS. 5a-c is a plan view of a horizontal form fill and seal system;

FIG. 6 is a plan view of a front of a package employing a tape closuresystem;

FIG. 7 is a perspective view of a diaper employing a tape closure system

FIG. 8 is a micrograph of a surface of a modified pressure sensitiveadhesive of Example 1:

FIG. 9 is a micrograph of a surface of a modified pressure sensitiveadhesive of Example 1;

FIG. 10 is a micrograph of a surface of a modified pressure sensitiveadhesive of Example 1;

FIG. 11 is a micrograph of a surface of a modified pressure sensitiveadhesive of Example 1;

FIG. 12 is a micrograph of a surface of a modified pressure sensitiveadhesive of Example 2;

FIG. 13 is a micrograph of a surface of a modified pressure sensitiveadhesive of Example 2;

FIG. 14 is a micrograph of a surface of a modified pressure sensitiveadhesive of Example 2;

FIG. 15 is a micrograph of a surface of a modified pressure sensitiveadhesive of Example 2;

FIG. 16 is a micrograph of a surface of a modified pressure sensitiveadhesive of Example 2;

FIG. 17 is a micrograph of a surface of a modified pressure sensitiveadhesive of Example 2;

FIG. 18 is a micrograph of a surface of a modified pressure sensitiveadhesive of Example 2;

FIG. 19 is a micrograph of a surface of a modified pressure sensitiveadhesive of Example 2;

FIG. 20 is a micrograph of a surface of a modified pressure sensitiveadhesive of Example 2;

FIG. 21 is a micrograph of a surface of a modified pressure sensitiveadhesive of Example 2;

FIG. 22 is a micrograph of a surface of a modified pressure sensitiveadhesive of Example 2;

FIG. 23 is a micrograph of a surface of a modified pressure sensitiveadhesive of Ex. 5.1.1 of Table 5;

FIG. 24 is a micrograph of a surface of a modified pressure sensitiveadhesive of Ex. 5.1.2 of Table 5;

FIG. 25 is a micrograph of a surface of a modified pressure sensitiveadhesive of Ex. 5.2.1 of Table 5;

FIG. 26 is a micrograph of a surface of a modified pressure sensitiveadhesive of Ex. 5.2.3 of Table 5;

FIG. 27 is a micrograph of a surface of a modified pressure sensitiveadhesive of Ex. 5.3.3 of Table 5;

FIG. 28 is a micrograph of a surface of a modified pressure sensitiveadhesive (Fuller HL-2811) sprayed with Fuller Swifttherm 84659 at a highsurface coverage of the 84659;

FIG. 29 is a micrograph of a surface of a modified pressure sensitiveadhesive (Fuller HL-2811) sprayed with Fuller Swifttherm 84659 at a 20%higher surface coverage than that of FIG. 28;

FIG. 30 is a perspective of the front view and the bottom view of theembossed liner showing the spacers and recesses;

FIG. 31 is a perspective of how the PSA with the sprayed filaments comein contact with the backside of the liner 240 of FIG. 2a when embossedand when the roll is self-wound;

FIG. 32 is a three-dimensional expanded view of the schematic of thetape closure system of an embodiment of the invention shown in FIG. 3:

FIG. 33 shows spray patterns produced by continuous signature,intermittent signature and control coat nozzles of Nordson Corporation;

FIG. 34 shows a VFFS machine wherein a flexible reclosure is appliedfrom a spool in the transverse direction to the web;

FIG. 35 shows how a die-cut self-wound roll of the reclosure tape isapplied to the web of packaging material;

FIG. 36 shows two die-cut geometries of the reclosure tape on a releaseliner;

FIG. 37 shows the schematic of a die-cut roll of reclosure tape appliedto the web of packaging material using a rotating vacuum drum;

FIG. 38 shows the schematic of a non die-cut tape which gets cut andapplied to the packaging material web using a reciprocating vacuum bar.

FIG. 39 shows the schematic of a non die-cut tape which gets cut in lineand is picked up by a vacuum drum and applied to the web of thepackaging material;

FIG. 40 is an illustration of a tape that is applied to a web ofpackaging material entering a VFFS machine;

FIG. 41 illustrates a self-wound roll of detackified PSA on a tapedispenser with a permanent or removable adhesive on the opposite sidewith an optional liner; and

FIG. 42 illustrates a self-wound roll of a detackified PSA on both sidesof a substrate with an optional liner on one side.

The following description and the drawings disclose various illustrativeaspects. Some improvements and novel aspects may be expresslyidentified, while others may be apparent from the description anddrawings.

DETAILED DESCRIPTION

Reference will now be made to exemplary embodiments, examples of whichare illustrated in the accompanying drawings. It is to be understoodthat other embodiments may be utilized and structural and functionalchanges may be made. Moreover, features of the various embodiments maybe combined or altered. As such, the following description is presentedby way of illustration only and should not limit in any way the variousalternatives and modifications that may be made to the illustratedembodiments. In this disclosure, numerous specific details provide athorough understanding of the subject disclosure. It should beunderstood that aspects of this disclosure may be practiced with otherembodiments not necessarily including all aspects described herein, etc.

As used herein, the words “example” and “exemplary” means an instance,or illustration. The words “example” or “exemplary” do not indicate akey or preferred aspect or embodiment. The word “or” is intended to beinclusive rather than exclusive, unless context suggests otherwise. Asan example, the phrase “A employs B or C,” includes any inclusivepermutation (e.g., A employs B: A employs C; or A employs both B and C).As another matter, the articles “a” and “an” are generally intended tomean “one or more” unless context suggest otherwise.

Provided is an adhesive closure system. In embodiments, the closuresystem is a two-part tape-based closure system comprising a first tapehaving a first pressure sensitive adhesive surface and a second tapehaving a second pressure sensitive adhesive surface, wherein the firstpressure sensitive adhesive and/or the second pressure sensitiveadhesive is modified to provide a surface having a reduced tack. Themodified pressure sensitive adhesive surface is modified such that thesurface has a relatively low tack or is non-tacky. The modified pressuresensitive adhesive surface has a tack such that an object, e.g., afinger, contents of a container, etc., can move over the modifiedpressure sensitive adhesive without sticking. The closure system withthe modified pressure adhesive surface(s) allows for the pressuresensitive adhesive surfaces to be brought together and adhered to oneanother (to form a seal or closure), but the modified surface(s) allowsfor the surfaces to be separated from or pulled apart from one another.The sealing and unsealing may be repeated numerous times to operate as aresealable closure system.

Referring to FIG. 1, an embodiment of a tape closure system 100 isshown. The system includes a first pressure sensitive adhesive 110having a first pressure sensitive adhesive surface 112, and a secondpressure sensitive adhesive 120 having a second pressure sensitiveadhesive 122. Each of the pressure sensitive adhesives is attached to asurface (130 and 140, respectively). The surface 112 and/or the surface122 is modified with an additive or material to reduce the tack of thesurface. The pressure sensitive adhesive surface 112 may be brought intocontact with pressure sensitive adhesive surface 122, and, with theapplication of limited pressure, the surfaces will stick together toform a closure or seal. The closure can be opened or unsealed byapplying a pressure or force to pull the surfaces away from one another.

The respective components of the closure system comprise a pressuresensitive adhesive. The pressure sensitive adhesive may be provided as atransfer tape, a double-sided tape, or coated on a facestock such as,for example, a paper, a film, or a foil. Referring to FIG. 2, anembodiment is shown in which one of the tape components of the enclosuresystem is provided as a double-sided tape 200. It is noted that the samestructure may also be presented in the form of a sheet where thedescribed structures are provided as die cut sheets of various lengthsand widths as needed for the particular application. The tape 200includes an adhesive which could be a heat, ultrasonic, RF activatable,or water, or solvent activatable adhesive, or a pressure sensitiveadhesive, including a permanent, removable, or ultra-removable pressuresensitive adhesive 210, a facestock or carrier film or substrate 220,and a pressure sensitive adhesive 230. The upper surface of the pressuresensitive adhesive 230 is modified to provide a surface 232 having areduced tack. In an embodiment, both the pressure sensitive adhesive 230and adhesive 210 have a reduced tack on their corresponding surface. Inone embodiment, the tape is disposed on a liner 240 when a pressuresensitive adhesive is used. The liner 240 can be a single or adouble-sided liner having a release surface (e.g., a silicone releasesurface) on one or both sides. The liner may be a single-sided ordouble-sided liner when in sheet form and a double-sided liner whenprovided as a tape. The liner can be a filmic or a paper liner. Incases, where a PSA is used, the tape is removed from the liner to exposethe adhesive 210, which will be used to adhere the tape to a surface(e.g., a surface of a container or package or article). The pressuresensitive adhesive 230 remains exposed and will provide the contactpoints with an opposing surface or tape to close or seal the package.The pressure sensitive adhesive 230 is modified with an additive ormaterial to provide a reduced tack surface. The tape 200 may be providedas a roll in wound form by winding the tape onto itself so the pressuresensitive adhesive 230 contacts the surface 242 of the liner 240 duringstorage. The tape may be supplied in bulk to a dispensing unit forapplying to a substrate in a package forming process. The tape could beprovided, if desired, in an individual dispenser (e.g., similar to aScotch™ tape dispenser) to manually remove a tape segment or strip asdesired.

The sheet and tape embodiments have applications, including closing filefolder envelopes, storage bags, gift wraps, and hospital gowns as wellas providing an attachment surface to attach things onto surfaces likerefrigerator, walls, or any other surface. These applications can spanconsumer, medical, industrial, office and other market segments wheretwo surfaces need to be temporarily attached and detached. In additionto the above, the embodiment with two reduced tack adhesives may be usedfor wrapping on itself to hold in place for applications such as wirewrapping, for holding catheters on arms, legs, and other surfaces. Thissystem can also be used for temporary closure with no damage done to theunderlying system. For example, the system may be used with giftwrapping, scrapbooking, photo albums, and other applications where it isimportant not to damage the objects being attached. As described above,one or both parts of the closure system may be modified to provide thereduced tack surface. Referring back to FIG. 1, in one embodiment, thefirst pressure sensitive adhesive 110 is provided with a modifiedsurface 112. In one embodiment, the second pressure sensitive adhesive120 is provided with a modified surface 122. In still anotherembodiment, both of the pressure sensitive adhesives 110 and 120 areprovided with modified surfaces. Further, it will be appreciated thatthe respective tape components (e.g., tape 110 or 120) may be the sameor different. For example, the tape components may use the same ordifferent adhesive material. If both pressure sensitive adhesivesurfaces are modified, the material providing the modified surface maybe the same or different from one another.

One or both of the pressure sensitive adhesives is modified to produce apressure sensitive adhesive surface having a relatively low, ornon-tacky surface. The modified surface having a low or non-tackysurface may also be referred to herein as a “detack surface.” Thepressure sensitive adhesive is modified by an additive that is either(i) admixed with the pressure sensitive adhesive and coated to form thetape, or (ii) applied to a coated pressure sensitive adhesive surface.The additive employed to modify the surface may be referred to herein asa “detack layer” or “detackified surface.” Applying the additive to acoated pressure sensitive adhesive surface may be accomplished by anysuitable method including, but not limited to, spraying, sprinkling,printing, brushing, dusting, etc.

The pressure sensitive adhesive employed as part of the tape system isnot particularly limited and may be chosen as desired for a particularpurpose or intended application. The PSA can be solvent, emulsion, orwarm/hot melt based and can be removable or permanent. The PSA can becured subsequent to coating using any of a number of crosslinkingmechanisms such as ionic, hydrogen bonding, chemical, or mixturesthereof and using stimuli such as thermal, UV, IR, or EB radiation. Anyof a number of PSAs from suppliers such as Dow, Henkel, BASF, and AveryDennison can be used for making these two-part tape-based closuresystems. Some examples of hot melt PSAs that can be used are HL 8005X,Swiftmelt 82674PW, HL 2811-PW from HBFuller and FA 20, Hammerlock, R128and Z3000 from Avery Dennison. Some examples of emulsion PSAs are AT20,AT20A, E898 from Avery Dennison. The choice of PSA is dictated byrequirements such as adhesion under refrigerator or freezer conditions,adhesion under wet conditions, adhesion to wet surfaces, adhesion underoily and fatty conditions, adhesion to oily and fatty surfaces, adhesionafter powdery and other particulate contaminants have been poured acrossthe tape surface, FDA requirements for direct or indirect food contact,etc. The PSA may be provided in a coat weight of from about 10 gsm toabout 100 gsm; from about 20 gsm to about 80 gsm; even from about 40 toabout 60 gsm. In one embodiment, the coat weight is from about 20 toabout 40 gsm.

The pressure sensitive adhesive is modified to provide a modifiedsurface topography that will reduce the tack of the pressure sensitiveadhesive. FIG. 3a illustrates a more detailed view of the modifiedadhesive surface(s). The additive or other material provides a pluralityof standoffs (or projections or protrusions) 150 and recessed areas 160.The standoffs provide a partially raised surface area relative to thesurface of the adhesive. FIG. 3b illustrates an embodiment of the tapesystem in a closed configuration when the modified tape surfaces arebrought into contact with one another. Without being bound to anyparticular theory, when a modified surface is brought into contact withthe surface of the other tape component, the tacky parts in the recessedareas 160 contact the smooth surface of the other tape component orcontact the protrusions 150 if the other tape surface is also providedwith a modified surface topography. In another embodiment, there may beareas of adhesives surfaces 130 and 140 that come together and contactone another when the tape components are brought together to provide theclosed or sealed configuration. FIG. 3b is a top view of the PSA surfacecontaining the detack material. In this illustration, the filamentssprayed randomly on the PSA surface are illustrated. These filaments arecompletely random in nature. In one embodiment, more than 50% of thefilaments overlap with each other, and cover the PSA surface withcoverage ranging from about 5% to about 70%.

The type, modulus, particle size, shape, height, amount, and coverage ofthe PSA surface with the additive controls the level of tack of the PSAsurface and slidability of the finger along the surface. The amount ofadditive controls the contact made between the PSA of the two surfacesand the peel value when the two surfaces are brought together and bondedusing applied pressure. Too little additive provides low surfacecoverage of the additive, and high contact area between the adjoiningPSA surfaces leading to a strong bond, while too much additive leads toa weak bond.

It will be appreciated that FIGS. 3a and 3b are merely illustrative ofan embodiment of a modified surface. It will be appreciated that thestandoffs may be provided in any arrangement and need not be ordered asshown in FIGS. 3a and 3b . The standoffs defining the detack surfacecould be provided as a regular repeating array or as a random array.Additionally, the standoffs could be of discrete shapes or non-regularshapes, like lines, filaments, fibrils, ellipsoids etc. The standoffsmay be provided by elongated lines, fibrils, or filaments of differentlengths and/or thicknesses. (See, e.g., FIGS. 13-22). FIGS. 23-27illustrate other embodiments of non-regular shapes, e.g., non-regulardots or ellipsoids, or irregular shapes formed when two printed areasmerge together. The standoffs do not necessarily have to be ordered suchthat standoffs on opposing adhesive surfaces do not contact one another.That is, a standoff on one adhesive surface may contact all, or aportion of, or none of, a standoff on the opposing adhesive surface. Inone embodiment, at least two of the standoffs partially overlap with oneanother such that at least one of the standoffs on a first adhesivesurface overlaps with at least one standoff on the second adhesive whenthe first and second adhesives are brought into contact with oneanother. This would occur, for example, if any of the modified surfacesof FIGS. 13-22 or 23-27 were brought into contact with one another.Further, adhesive on one side of the reclosure could contact adhesive onthe other side or a combination of adhesive and standoff on the otherside.

In one embodiment, the filler material is admixed with the pressuresensitive adhesive prior to coating. The additive is provided such that,upon formation of the pressure sensitive adhesive surface (e.g., viadrying or curing or merely coating), the particles protrude or projectfrom the surface of the adhesive. In another embodiment, the standoffsmay be provided by applying an additive or material to a pressuresensitive adhesive. In such embodiments, the additive may be applied tothe pressure sensitive adhesive surface by any suitable methodincluding, but not limited to, printing, spraying, sprinkling, dusting,brushing, etc.

The standoffs may be provided in a random array or in a regular oruniform pattern. Methods such as printing may be required to provide thestandoffs in a regular/uniform pattern. This allows a user to controlthe surface topography of the pressure sensitive adhesive. The standoffsmay be provided as discrete dots or shapes or may be provided as aseries of lines or filaments or fibrils of a uniform or varied (i.e.non-uniform) length or thickness. When provided as lines (including asfilaments or fibrils) or shapes of a substantial length, the lines maybe provided as uniform or random lines and may be straight, curved,undulating, zig-zag, stepped, etc.

Examples of suitable fillers include, but are not limited to, inorganicfillers, polymeric beads, etc. Some specific examples of suitablematerials for providing the standoffs include, but are not limited to,hollow Expancel polymeric beads from Akzo Nobel, solid, elasticpolymeric beads from any of a number of suppliers, or inorganic fillerssuch as CaCO₃ from JM Huber Corporation. Inorganic fillers and polymerparticles may be provided by admixing the inorganic filler or polymerparticles into the pressure sensitive adhesive prior to coating.Alternatively, the inorganic filler or polymer particles may be appliedto the surface of a pre-coated pressure sensitive adhesive by spraying,dusting, sprinkling, etc.

In other embodiments, the standoffs may be provided by inks, elastomericmaterials, polymeric materials, etc. In embodiments, the standoffs maybe provided by hot melt or emulsion polymers. In one embodiment, thestandoffs are provided by an emulsion polymer. Such materials may beapplied to the surface of a pressure sensitive adhesive by any suitablemethod including, but not limited to, printing and spraying. The modulusof the polymeric or elastomeric material should be in the range fromjust below Dahlquist criterion (10⁶ dyne/cm²) and higher. Inembodiments, the elastomeric or polymeric material has a modulus ofabout 0.5×10⁶ dyne/cm² or greater. Various hot melts can be used forspraying onto the PSA surface, such as Advantra PHC 9200 (softeningpoint (SP) of 102° C.) from HB Fuller, 3H049B (SP of 82° C.), HL 7216(SP of 74° C.), PHL 4157 (SP of 67° C.), HL-0842S (SP of 155C),Swifttherm 84659 (SP of 117° C.) etc.

In one embodiment, spraying with a hot melt polymer can be carried outusing any suitable spray system. An example of a suitable spray systemincludes, but is not limited to, a Nordson Universal spray nozzlesystem. Any of a number of different nozzle types to control thefilament size and pattern may be used to accomplish spraying. Somenozzle types include the Continuous signature nozzles, Intermittentsignature nozzles, and Control coat nozzles made by Nordson.

The samples of the PSA surface sprayed with the filaments of the detackmaterial were produced at the Nordson Labs in Duluth, Ga. either on abenchtop spray unit or on a roll to roll unit. For benchtop trials, alaminate of a pressure adhesive coated on a film and protected with aliner was used. For the trial, the protective liner was removed and thefilm with the exposed PSA side facing up was placed on the tabletop web,web turned on to the desired speed and the PSA surface was sprayed withthe non-tacky elastomer.

For the roll to roll trial, a 1 mil PET film pre-coated on one side witha hot melt PSA and protected with a double-sided liner was coated atNordson with a hot melt rubber based PSA on the uncoated side of the PETusing a slot die with rotating rod (to smooth the coating) at thedesired coat weight and the freshly coated and exposed PSA surface wassprayed with the detack material. After spraying, the laminate wasself-wound with the double-sided liner protecting both the PSAlayers—one side with just the PSA layer and the other side with thedetack spray on the PSA surface.

Hot melt elastomers are used as the preferred detack spray materialswith melt viscosities ranging from about 300 to about 3000 cps (at 275to 350° F.). The spray nozzles used were continuous signature,intermittent signature or control coat nozzles. The nature of the spraypattern produced by these different nozzles is shown in FIG. 33. Thesespray units are commonly used to deposit very high levels of spraymaterial in, for example, non-woven applications or for sprayingadhesives for heat lamination applications. In one embodiment, a smallquantity of the spray material was used on the surface of the PSA usinga large amount of air to create a fine spray randomly spread across thePSA surface.

In one embodiment, surface coverage of the PSA surface with the detackmaterial ranged from about 10% to about 70%.

FIGS. 12 through 22 and FIGS. 28 and 29 show different embodiments ofcoverage of the detack material on the PSA surface. For these trials,the surface of the PSA was at ambient temperature before it reached thespray station and the fibrils/filaments of the detack material weredeposited on the PSA surface. The width/thickness of the filamentsranged from few microns (10μ or so) to several tens of microns (100μ ormore). The length of the filaments are several orders of magnitudelarger than the width, ranging from about 1 mm and longer. The length ofthe filament depends on the intrinsic properties of the elastomer and onthe processing conditions. Each of the linch wide Nordson nozzle moduleshas about 10 orifices, and multiple patterns of air blows around thefilaments exiting these orifices, before the filaments float down to thePSA surface. Due to the air flow, there is substantial overlap betweenthe adjoining filaments as they settle on the surface (seen in FIGS. 12through 16). Depending on the temperature of the PSA surface and thefilament temperature, in certain embodiments there is a possibility ofslight penetration of the PSA surface by the filament. The pattern ofthe spray is completely random as seen from the Figures. The filamentsare deposited onto the surface by falling onto the surface. There is nodefined base or tip or geometry to the structure and the structurecomprises entirely random filaments deposited on the surface withoverlap/stacking happening randomly.

In FIGS. 12 through 22, a removable adhesive from Fuller (HL 8005X) wasused. Three different coat weights of the adhesive were sprayed withFuller Advantra PHC 9200. Since the peel adhesion of this adhesive islow, a lighter surface coverage (ranging from about 15 to 30%) with thefilaments was targeted initially, thus leaving a large land area of thePSA surface to get adequate T peel values upon bringing the 2 modifiedsurfaces together. Table 2 lists the percentage of the PSA surfacecovered by the fibers/filaments. The lower surface coverage with thedetack material was adequate to get reasonable finger slidability(rating of 4 to 5) indicating that a solid object could easily slideacross its surface so long as the weight (force) exerted by the objectonto the surface was low (such as by a particle of cheerios). Threedifferent types of nozzles were used in the study—Nordson low flowcontinuous signature nozzle (FIGS. 12 through 16), Nordson IntermittentSignature nozzle (FIGS. 17 through 19) and Nordson Control Coat nozzle(FIGS. 20 through 22). With both Intermittent and Control coat nozzles,there were a lot of lumpy large protrusions (nodules) in thefibrils/filaments (seen in FIGS. 17 through 19) which acted as largespacers projecting away from the surface of the PSA. With the controlcoat spray nozzle, pattern air pressure was increased to lower thefilament size and thereby eliminate the nodule formation. In oneembodiment, the filament size and nodule formation were substantiallyreduced by increasing the pattern air pressure. The large spacers aredetrimental to the ease of closing the two tape sides and because oftheir large size (some of the order of a 1 mm or larger) act to open thebond with time. In one embodiment, a low flow continuous signaturenozzle was used.

For FIGS. 28 and 29, a permanent PSA from Fuller (HL-2811) was used. TheT peel data of this PSA laminate attached to itself without any detacklayer was a very high 21 N/inch indicating very high bond strength. ThisPSA was coated onto a 1 mil PET film on the Nordson roll to roll unit at30 gsm of adhesive coat weight, and sprayed with Fuller Swifttherm 84659(SP of 117° C.) using the continuous signature nozzle. The processconditions were identical, the main difference being the spray materialthroughput being 20% higher for FIG. 29. FIG. 28 had surface coverage ofthe filaments of 44.3% vs 46.8% for FIG. 29, both had filamentwidth/thickness of around 31μ, friction of FIG. 28 was 0.52 lb vs 0.48for FIG. 29, and T peels were 7 N/inch vs 5.8 N/inch. Interestingly theT peels after 10 cheerio exposures were 1.6 N/inch vs 0.3 N/inch. FIG.28 is acceptable for the application showing good closure strength ofabout 7 N/inch and after significant exposure to cheerios still gave anacceptable 1.6 N/inch for adequate bag closure strength. The figuresshow a high degree of overlap/stacking of the filaments consistent withhigher throughput, coverage and pattern air pressure.

Various hot melt elastomers can be used for spraying onto the PSAsurface, such as Advantra PHC 9200 (softening point (SP) of 102° C.)from HB Fuller, 3H049B (SP of 82° C.), HL 7216 (SP of 74° C.), PHL 4157(SP of 67° C.), HL-0842S (SP of 155C), Swifttherm 84659 (SP of 117° C.)etc. The finger tack, slidability and the peel force after closure andopening can be regulated by choice of SP of the material used—higher thesoftening point, easier is the slidability (lower finger tack) and lowerT peel on closure for a given closure force.

The spray pattern can be varied by manipulating a number of processvariables, including but not limited to temperature of the spraymaterial (and hence viscosity), the pattern air pressure (higherpressure gives finer fibrils/filaments, lower pressures giving thickerfilaments), pump speed or throughput (which regulates the amount ofmaterial being deposited and hence coverage), distance between the sprayunit and the PSA surface and the web speed.

In one embodiment, the width of the spray nozzle module is 1″ and thenozzles are mounted side by side to get wider spray patterns to cover awide web. Since the spray modules are contiguous, there will be someoverlap of the spray between the modules further leading to overlap ofthe filaments. So, the detack filaments will range from single filamenton the PSA surface and in some cases many filaments stacked on top ofeach other.

The pattern of filaments on the surface is completely random. When twosuch surfaces are brought together, there is no intermeshing orparticular order in which a bond is formed. The bond strength isdetermined by a number of factors—the type of adhesive used (and itsinherent bond strength as determined by its chemistry, modulus,crosslinking, coat weight), the modulus and softening point of thefilaments, the height of the filaments (which will vary randomly acrossthe surface due to stacking or overlap in certain regions), thepercentage of the surface of the PSA covered by the filaments. As thesurfaces are brought together, the interactions are likely to be betweenthe open areas of PSA of side A with open areas of PSA of side B, PSA ofside A forming a bond with filaments of side B and vice versa.

Liquid based inks can also be used for modifying the PSA surface toprovide the standoffs. The inks can be either printed or sprayed. In thelab, a multi-purpose Professional air brush kit such as from Apontus canbe used for modifying the PSA surface to provide low to no tack, withgood self-stick characteristics.

FIGS. 23 through 27 show the spray coated water-based ink system(Colorcon FGN 3427 black ink) onto the surface of several PSAs. As canbe seen from the figures, the pattern is very random in nature and asignificant number of particles are not all separate and discrete.

FIG. 23 used AD FA20 adhesive at a coat weight of 30 gsm and theColorcon FGN 5427 was sprayed onto the surface using the Apontus spraysystem at ink coat weight of 7.7 gsm. The ink surface coverage was 12.2%and the T peel of this laminate system was 3.3N/inch. The ink in thefigures shows up as the dark spots on the light background, thebackground being the PSA.

FIG. 24 also used FA20 adhesive at a coat weight of 30 gsm and theColorcon FGN 5427 was sprayed onto the surface using the Apontus spraysystem at ink coat weight of 9.3 gsm to give a surface coverage of 19.4%and the T peel of this laminate was 3.3 N/inch.

FIG. 25 used AD R-128 adhesive at a coat weight of 30 gsm and theColorcon FGN 5427 was sprayed onto the surface using the Apontus spraysystem at ink coat weight of 7.8 gsm. The ink surface coverage was 14.6%and the T peel of this laminate system was 4.2 N/inch.

FIG. 26 used AD R-128 adhesive at a coat weight of 30 gsm and theColorcon FGN 5427 was sprayed onto the surface using the Apontus spraysystem at ink coat weight of 9.8 gsm. The ink surface coverage was 24.6%and the T peel of this laminate system was 2.6 N/inch.

FIG. 27 used AD Z-3000 adhesive at a coat weight of 30 gsm and theColorcon FGN 5427 was sprayed onto the surface using the Apontus spraysystem at ink coat weight of 9.9 gsm. The ink surface coverage was 24.3%and the T peel of this laminate system was 3.6 N/inch.

The particle size of the particles in FIGS. 23 through 27 as measured byVertical Scanning Interferometry ranged from about 2 to about 25microns.

The adhesion (peel value) of the resulting modified PSA can be variedusing a number of variables including, for example, the type of PSA andthe coat weight, the height of the standoffs, the diameter or width ofthe standoffs, the modulus of the standoff, the coat weight of theadditive, and the surface coverage. The peel value is also dependent onthe flexural modulus and stiffness of the laminate controlled by anumber of factors: modulus and stiffness of the facestock material suchas PET, BOPP and such, the type of PSA (stiffness and coat weight, i.e.thickness) used to laminate the tape to the bag and the stiffness of thebag material. All these can be manipulated to control the level ofdetackiness and the adhesion.

The height of the standoffs may be selected as desired for a particularapplication or intended purpose. Smaller standoffs (i.e. lower heightstandoffs) will provide a higher level of adhesion between the tapes,which will provide a tighter seal and require a greater force to openthe closure. The height of the standoffs may range from a few microns toseveral hundred microns. In one embodiment, the height of the standoffis from about 2 μm to about 500 μm; from about 10 μm to about 300 μm;from about 25 μm to about 250 μm; from about 50 μm to about 150 μm; evenfrom about 75 μm to about 100 μm. Intermediate heights can be achievedusing non-tacky or slightly tacky microspheres or fillers such as CaCO₃having diameters in the range of interest such as 10 to 100 μm. Largerheights can be achieved using the Nordson spray unit.

In embodiments, the standoffs may have a diameter, circumference, orthickness of from about 5 μm to about 500 μm; from about 10 μm to about250 μm; from about 25 μm to about 150 μm; even from about 50 μm to about100 μm.

The dimensions of the standoffs and the space between the standoffsand/or surface coverage of the standoffs may be varied to control thebond strength of the reclosure system. For example, the larger theheight of the standoff, the greater the distance may be between thestandoffs to still achieve a relatively high adhesion. The adhesion iscontrolled, however, to allow for sufficient adhesion when the modifiedtape surfaces are brought together but separated from one another onapplication of a suitable force.

The coat weight of the printed or sprayed standoffs may be in the rangeof from about 2 gsm to about 40 gsm; from about 5 gsm to about 30 gsm;even from about 2 to about 25 gsm.

The standoffs, whether premixed with the pressure sensitive adhesive orlater applied to a pressure sensitive adhesive surface, may be providedat a concentration to provide a particular surface coverage. Thestandoff surface coverage will also contribute to the level of adhesionbetween the tape surfaces. In embodiments, the standoffs cover fromabout 5% to about 60% of the total surface area of the pressuresensitive adhesive; from about 10% to about 50%; from about 15% to about45%; even from about 20% to about 30% of the total surface area of thepressure sensitive adhesive.

The peel value is also dependent on the flexural modulus and stiffnessof the laminate controlled by a number of factors including, forexample, the modulus and stiffness of the facestock material such asPET, BOPP, etc., and the type of PSA (stiffness and coat weight, i.e.thickness) used to laminate the tape and the container material.

The T peel value of the tape to tape laminate (attached to the bagmaterial) can be tailored depending on the application, ease of openingand the number of reclosures needed, and can range from as low about 0.2N/inch to about 20 N/inch; from about 0.5 N/inch to about 10 N/inch;from about 1 N/inch about 5 N/inch; even from about 2 N/inch to about 4N/inch. In embodiments, the system has a T Peel value of at least 0.5N/inch or higher after 10 reclosures. In embodiments, the system has a TPeel value of 0.5 N/inch to 15 N/inch; from 1 N/inch to 10 N/inch, orfrom 2 N/inch to 4 N/inch after 10 reclosures. Methods of evaluating TPeel are described herein.

The tape product can be further enhanced by using colored inks or othercolored additives in the spray, ink, or additive such that one part ofthe tape has color A, and the other part of the tape has color B so thatwhen the tapes are adhered to one another and arranged in a closed orsealed configuration it leads to a secondary color C indicating thatcomplete closure has taken place. Other functionalities can becontemplated in the tape (either formulated in the adhesive or in thesurface modifier) such as tamper evidence, proof of sterilization,anti-bacterial feature to prevent ingress of pathogens, oxygenabsorption feature to prevent ingress of oxygen, a PSA that is waterresistant to create a waterproof seal, and such.

The tape may be sized and dimensioned as desired for a particularpurpose or application. In one aspect, the tape may be sized with adesired width and length to allow for attachment of the tape to asubstrate at a desired or selected processing speed. In embodiments, thetape may have a width of from about 0.25 inches to about 3 inches; fromabout 0.5 inches to about 2 inches; or from about I inch to about 1.5inches. The tape length may vary as desired. In embodiments, the tapehas a length of from 0.5 inches to about 60 inches; from about I inch toabout 45 inches; from about 2.5 to about 30 inches; from about 5 toabout 25 inches; from about 10 to about 20 inches.

The tape closure system can be used for a wide range of closureapplications and articles utilizing such enclosures. In embodiments, thetape is particularly suitable for use with a flexible package, or aflexible substrate that is attached to a rigid package structure(including, by way of exemplary embodiments, a film or foil lid attachedto a plastic cup or holder). The tape closure system may be applied to avariety of materials that are employed to make such containers orpackages. Flexible packages may be made from a variety of materialsincluding, by way of exemplary embodiments, polymeric materials, paper,nonwoven materials, foils, and other such materials. Polymeric films areoften used to make flexible packages. Suitable polymeric films include,by way of exemplary embodiments, polyolefins, polyesters, nylonmaterials, etc. Films are typically biaxially oriented polypropylenefilms, but may be polyester, nylon, cellophane and/or polylactic acidfilms. Polymeric films produced with a cast or blown process can beused, but their lower machine direction tensile strength and excessiveextensibility under tension or under thermal exposure may preventadequate lamination. These biaxially-oriented polymeric films aretypically used as the outer film and the inner film in a compositelaminated structure. The above-identified embodiments are exemplary andfor the sake of brevity not all applicable package structures areincluded. The present teachings, however, can apply to any type orconfiguration of package structures.

Examples of suitable flexible packages include, but are not limited to:

-   -   Pillow pouch packages. These packages are sealed on the top and        bottom of the package with a vertical seam. Such packages are        used with cereal, potato chips, pretzels, etc. The packages may        be formed from any suitable material, including, without        limitation any type of food safe material.    -   Stand up pouches, which are typically employed with candy,        snacks, liquids, etc. The pouches may be formed from any        suitable material, including, without limitation any type of        food safe material. Moreover, the pouches may be of any        configuration and are not limited to those shown.    -   Flat bottom bags used for coffee, pet food, or to store large        volumes of material. The flat bottom bags may be formed from any        suitable material, including, without limitation any type of        food safe material.    -   Double seam consumer bags (e.g., bread bags). The double seam        consumer bag may be formed from any suitable material,        including, without limitation any type of food safe material.    -   Bar wrap packages (e.g., for candy bars, snack bars, protein        bars, etc.). The bar wrap packages may be formed from any        suitable material, including, without limitation any type of        food safe material.    -   Flexible overwrap packages (e.g., for cookies). The flexible        overwrap packages may be formed from any suitable material,        including, without limitation any type of food safe material.    -   Flexible lid on a rigid package. The flexible lid may be formed        from any suitable material, including, without limitation any        type of food safe material. Persons skilled in the packaging art        will understand and appreciate the types of packages described        above and will understand that the present teachings apply to        any applicable configuration of packaging.

The tape closure system can be employed in articles and packages usedfor a variety of applications and to store a wide range of materials.The tape may be used in articles as for packaged goods such as pet foodbags; prepackaged foods such as cereal; snacks such as chips, cookies,crackers; pre-packaged cheese and meats; confectionary; coffee:nutritional foods; food storage bags; other applications such as inpersonal care (tissues, diaper tapes and such), or medical, industrial,and other business to business applications. These tapes can also beused for pre-made bags which are used to store all kinds of food andnon-food items.

In one embodiment, the tape may be attached to the flexible substrate.The tape employed may be a two-sided tape (e.g., as illustrated in FIG.2a and FIG. 2b ). The substrate facing adhesive (e.g., adhesive 210) ischosen to impart appropriate adhesion to the flexible material of thesubstrate.

The two-part adhesive system is applied to the surfaces of the articlethat are to be joined together to selectively close or seal the article.By way of a non-limiting example, in a package (e.g., a food package)provided as a bag, the article (or more specifically the package) maycomprise opposing sidewalls formed from a flexible material each havingan inner surface with an opening at one end between the two sidewalls.Referring to FIG. 1, the surfaces 130 and 140 may, for example,represent the surfaces of the sidewalls. A thin PSA layer may be used toattach the tape to the bag. A thin PSA layer is desirable to minimizethe 1-beam effect and lower the overall stiffness of the laminate.Suitable PSA's for bag attachment includes but are not limited to, AveryDennison S246, Avery Dennison Hammerlock etc. The adhesive closuresystem is provided by providing a first adhesive on a surface of thesidewall and a second adhesive on the surface of an opposing sidewall,where the adhesive closure system is such that one or both of theadhesives is modified with a plurality of standoffs defining themodified surface topography to provide the reduced tack system. It is,of course, contemplated, that the adhesive closure system may be used inother packages and not just limited to conventional bag type packages.For example, the closure system could be used in a package with a “peelaway” opening. Further still, a plurality of tape closure systems may beutilized on a single package. By way of a non-limiting example, two,three, four or more such tape closure systems may be utilized inconjunction with a single package. For example, a package may includetwo open ends whereby one tape closure system is operatively positionedon one end and a second tape closure system is operatively positioned onthe second end. Any such configuration is contemplated hereby.

The tape may be applied to the flexible material in any suitable manner.The tape can be attached to the flexible material using automaticdispensing equipment in a continuous or intermittent manner. The tapecan be attached through a manual process as well. The tape could beapplied to the flexible material in the same direction as the packagingmaterial web or the package making process (i.e., in the machinedirection (MD)), perpendicular to the packaging material web or thepackage making process (i.e., in the transverse direction (TD)), or inany direction that is efficient to the applicable system. For example,the direction could be at a generally 45-degree angle relative to thedirection of the packaging material web or package making process. Thepresent teachings contemplated any variation of such angles. A tapedispensing mechanism may be incorporated into the unit to form thepackaging. The tape dispensing mechanism may be of any appropriateconfiguration and type. The tape dispensing mechanism can allow formodifications to the location at which the tape is applied, can have astandard location that is not readily adjustable, or can comprise acombination of such. The tape dispensing mechanism may be manuallycontrolled or controlled through a processor device, e.g., a computer orthe like.

The tape can be applied to the flexible material off line and prior tofilling the package, or the tape can be applied to the flexible material“in situ” as the bag is formed and filled with the desired contents. Inembodiments, the tape is applied to the package in situ as the bag isfilled with the desired contents. The tape can be applied in systemsincluding vertical form fill and seal systems 300 and horizontal formfill and seal systems 400. It should be understood, however, that theseare merely exemplary locations and that the tape can be applied in anyappropriate direction relative to the applicable package. An example ofa vertical film form and seal system 300 is illustrated in FIG. 4. Suchsystems are known to those skilled in the art. In such systems, theapplicable contents are poured into the package using gravity. FIG. 4illustrates a system 300 in which packaging film 310 is taken from aroll 312 of film and passed through tensioners 314 that keep it taut.The film then passes over a former, which directs the film into avertical tube around a product 50 delivery cylinder 316. The tape systemis provided by applying tape 200 to a section of the film. The tape 200is applied to selected parts of the film transverse to the direction inwhich the film is being fed. As the tube is pulled downward by drivebelts, the vertical tube of film is sealed along its length by avertical sealer, forming a back seal. The machine then applies a pair ofheat-sealing jaws against the tube to form a transverse seal. Thistransverse seal acts as the top seal on the bag below the sealing jawsand the bottom seal on the bag being filled and formed above the jaws.After the transverse seal has been formed, a cut is made across thesealed area to separate the finished bag below the seal from thepartially completed bag above the seal. The film tube is then pusheddownward to draw out another package length. Before the sealing jawsform each transverse seal, the product 50 to be packaged is droppedthrough the product delivery cylinder and is held within the tube abovethe transverse seal. It will be appreciated that the system FIG. 4 isjust one example. Although, it should be understood that the package maybe filled in any appropriate manner—especially depending upon thecontents to be inserted in the packaging. By way of a non-limitingexample, the contents may be filled into the packaging utilizingpneumatic pressure, hydraulic pressure, physical force, pushing force,or any such manner. Further, the contents may be inserted into thepackaging through use of separate tools, e.g., blades, arms, etc. Inaccordance with some embodiments, the tape is dispensed in thetransverse direction to form the reclosure mechanism.

Examples of horizontal form fill and seal systems 400 are shown in FIGS.5a-5c . In such systems, the product 50 is moved on a conveyor belt 418,428, 438, and the flexible package is wrapped and sealed around theproduct. In accordance with some embodiments, a closure system formedfrom the present tapes is provided by applying or dispensing the tape inthe transverse direction relative to the direction in which the packageis formed. The present teachings are not limited to this configuration.The tapes may be applied to the packaging in any applicable directionand are not limited to those described herein. The descriptions aremerely exemplary and are not intended to be exhaustive.

FIGS. 6 and 7 illustrate examples of environments in which the tapeclosure system may be employed. FIG. 6 illustrates a package 500 (as maybe formed by any suitable method) for storing a material (e.g., a foodproduct) 510. The package includes an end seal 520 at a first end of thepackage, and an end seal 530 at the other end of the package. End seal520 may be broken and separated to open the package. The packageincludes a tape closure system 100 for selectively resealing the packageas may be desired.

FIG. 7 illustrates a diaper employing a closure system in accordancewith the present technology. The diaper 600 includes a tape system 100that includes a tape 110 disposed on a front face of the diaper and atape 120 disposed on an edge of the back panel. A portion of the tape120 hangs over the edge. The portion of tape 120 overhanging the edge ofthe diaper and oriented toward the diaper is brought into contact withthe surface of tape 120 to close the diaper. The exposed surface of thetape 110 includes a modified surface, and the surface of tape 120 thatis oriented toward the diaper includes a modified surface to unseal thediaper and to selectively reseal the diaper as desired. It will beappreciated that a portion 120 a of the tape 120 may comprise apermanent adhesive to permanent attach a portion of the tape to thediaper surface. The underside of portion 120 b comprises the modifiedadhesive surface to be releasably secured to the tape 110.

The following examples illustrate embodiments in accordance with aspectsof the present teachings. Various pressure sensitive adhesives weremodified with an additive material to provide a modified surfacetopography (also referred to as a detack layer or detack surface). Theterm PET and Mylar are used interchangeably in the examples and tables.

The tape as shown in FIG. 2a is made on a large adhesive coating andmanufacturing machine and gets wound up into large master rolls. Thepressure in the middle of such a roll can be as high as 100 to 120 psidepending on the size of the roll and winding tension used during rollwinding. The filaments 232 sitting on the adhesive surface 230 afterwinding contact the back side of the liner 240. Because of the pressuresin the roll, a part of the filaments 232 may get pushed into the PSAlayer 230. The force and pressure vary from the outside to the center ofthe roll, the higher pressure being closer to the core. This varyingpressure leads to varying amount of penetration of the detack layer intothe PSA leading to varying height of the detack layer on the surface ofthe PSA depending on the position in the roll. The height of the detacklayer depends on the spray conditions and can range from a few micronsto several tens of microns and preferably being 20 to 50 microns. Thedetack layer controls the slidability, tack and bond strength and thevariation in height due to the pressure pushing it into the PSA leads tovariation in product performance i.e. bond strength and slidability.

In one embodiment, the tape comprises embossing a side of the liner 240which contacts the detack layer on winding the roll. Here the liner 240is chosen so that it is embossable. The liner could be a paper or a filmcoated on one or both sides with an embossable layer such as low densitypolyethylene (LDPE) or medium density polyethylene (MDPE) orpolypropylene (PP) followed by siliconization on top of these embossablelayers on both sides. The LDPE, MDPE or PP coating thickness could rangefrom 20 microns up to about 100 microns. Embossable liners are generallyavailable from companies like Mondi (such as P-Liner, which is apolycoated kraft paper both sides coated with PE and siliconized) orLoparex (such as Poly Silk, polycoated paper liner coated both sideswith PE and siliconized). Under pressure and temperature, the LDPE, MDPEor the PP can be softened and various patterns can be embossed into theliner. The embossed recesses can range in depth from about 10 microns toabout 90 microns and form the pockets, nests or recesses to prevent thefilament 232 (FIG. 2b ) from contacting the full face of the surface of240 which would be contacted in an unembossed case. The only regionsthat contact the detack side are the spacers on the side of 240 whichdirectly contact the filaments 232.

FIG. 30 (Front view) shows the embossed liner with the LDPE, MDPE or PPside embossed in a simple pattern to form recesses in the machinedirection. The pattern depth (recess depth) can range from 10 to 90microns, width being varied depending on the width of the tape neededfor the application. This tape width could be 0.5″, 0.75″, or 1″ or evenwider. The width of each recess element between the spacers can also bevaried. In one embodiment, the spacers make full contact with thefilaments of 232 thereby pushing the filaments into the PSA. If thepushing and embedding of the filaments into the PSA is to be minimizedacross the wide web, the width of the raised spacer has to be small andvice versa. Any pattern that minimizes the exposure of the detack layerto the back side of the liner and hence minimizes the amount of detacklayer that gets pushed into the PSA will provide a tape with surfacethat performs within acceptable limits.

The tape width used for most of these applications is 0.5, 0.75 or 1inch and the pattern is so chosen that when the rolls are slit to makethese narrow rolls, the amount of the detack embedded in the PSA isminimal. A simplistic pattern is shown in FIG. 30 (Bottom view), whichis a bottom view of the embossed liner. Such a pattern can be createdusing a heated embossing roll that has the negative pattern of thepattern being embossed as the liner goes through a nip between theembossing roll and a backup roll. These master rolls are eventually slitto the width of the tape used for the application such as inside a bagfor closure of the bag. The slitting of these rolls is done such thatthe slitting blade slits or cuts the roll in the center of theunembossed spacer. This way just the edges of the tape contact therelease liner when wound, thus minimizing the penetration of thefilaments (detack layer) into the PSA. Since the penetration of thefilaments (detack layer) at the edges is just a tiny portion of theoverall tape, it does not negatively affect the performance.

Another embodiment consists of coating the PSA in patterns (in stripesin the machine direction) leaving small gaps in between the stripes alsoin the machine direction, the gaps corresponding to the edges of thetapes that make contact with the spacers and not spraying the detackmaterial in these uncoated PSA stripes. Thus, for example, when making a1″ wide PSA tape, the spacer could be designed to be 0.2″ wide at eitherend, and the PSA coating done so that 1″ wide PSA is coated with 0.2″gap on either side of the PSA stripe. This is registered with the detacksprayer so that no detack layer is sprayed in this region without PSA.This way, the portion of the web uncoated with PSA makes contact withthe spacer. The slitting of the wide roll to make individual tape rollsis carried out in the middle of this 0.2″ spacer, and after slitting,the very edges of the tape will have no adhesive. The rest of the tapewith PSA sprayed with detack layer on top gets nested and isn't pushedinto the PSA. Besides the geometry explained above i.e. strips in theliner along the machine direction, other embossed geometries in theliner such as hexagonal patterns etc. can be made to minimize thepenetration of the detack layer into the PSA when it contacts the backof the liner. Such embossed geometries can be made to minimize thepenetration of the filaments and manage the adhesion properties of thetape in large rolls subjected to varying pressures.

In one embodiment, a filmic liner is made by extruding a polyethylene(PE), a polypropylene (PP) or a polyester (PET) film in such a way thatthe raised portions are created during extrusion in the form of thingrooves either in the machine direction or different geometric patternscan be introduced in this film that serve as standoffs. This film cannow be coated either in line during extrusion or after extrusion with asilicone coating to form a siliconized liner with a structure similar tothe one contemplated by embossing a paper liner containing extrusioncoated LDPE, MDPE or PP with a silicone coating on the top. Such a filmwould have raised portions acting as spacers and the recesses acting asnesting regions for the PSA containing sprayed detack layer when the twosurfaces are brought together. Such a surface when contacted with thedetackfied adhesive surface creates patterns on the detackified adhesivesurface where the raised portions push in the detack layer into theadhesive. By manipulating such a liner surface and hence the detacklayer getting pushed in to the adhesive, the adhesion values can bevaried or dialed for different applications.

In another embodiment, spacers can be created by taking an extruded filmor a paper and either printing or depositing or spraying entities on thesurface which act as the spacers. The silicone coating is carried out onsuch a surface to create a siliconized liner with spacers and nestingregions.

Besides a self-wound structure, another embodiment comprises a structureof the laminate where there are two liners, one on the bottom PSA (PSA210 and liner 240 of FIG. 2b ) which is the PSA used to attach the tapeto the bag and a top side liner which protects the detackfied PSA (lineron top of surface 232 of FIG. 2b ). The bottom liner (liner 240) couldbe a liner without any geometric pattern on it while the top liner (ontop of surface 232) could be the embossed liner or liner created by anyone of the above described means.

In an embodiment of the present invention method, a functional materialis continuously applied in the form of a tape to packaging materials ona packaging machine. Flexible material used for packaging includeswithout limitation films (e.g., PE, PP, PET, polyamide, and Polyvinylchloride), metallized films, multi-layer films with barrier layers andother functional layers such as oxygen scavenging layers, paper (with orwithout coatings) and multilayer laminates (foil, paper, plastics). Inanother embodiment of the invention method, a detackified pressuresensitive adhesive based tape is applied in the transverse direction ona packaging machine.

An embodiment of the invention method is described herein for a VerticalForm Fill Seal machine (VFFS) as an example. The invention method isalso applicable to other machines designed to form flexible materialsinto a package. The embodiment of the invention method considersapplication of tapes to packaging materials for which the tapes have atypical multi-layer construction (as shown in FIG. 2b ) of a liner(240), a PSA (210) (which will subsequently form a bond with thepackaging material), a substrate (220) (typically a film) and afunctional surface (232). The functional surface could be a mechanicalclosure system (such as, but not limited to, a plastic zipper, aZip-lock system or velcro) or an adhesive closure system (such as, butnot limited to, a cohesive system or a PSA based adhesive system) or anyother functional system that can be supported by the disclosedconstruction. The tape is applied to the packaging material in acontinuous manner in the same process as the one where the packagingmaterial is subsequently converted into a package (such as, but notlimited to, a bag or a pouch). After the package is formed the tape isarranged so that the functional surfaces of the tape can be bought intocontact to form, for example, a closure of the package. This closure maybe permanent (i.e. not allowing reclosure after breaking) or could forma reclosure allowing the package to be repeatedly open and closed.

A VFFS machine (FIG. 4) is a type of automated assembly-line productpackaging system, commonly used in the packaging industry for food, anda variety of other products. The machine constructs bags out of a flatrolls of film or other suitable materials, while simultaneously fillingthe formed bags with product and subsequently heat sealing the filledbags. Both solids and liquids can be bagged using this packaging system.A typical use for such a system is the packaging of cereals. The VFFS,often operating at very high speeds (>70 bags/min), produces bags ofcereal which have permanent heat seals along three dimensions (top,bottom and side). The method allows, for example, another sealing systemto be introduced in the transverse direction (i.e. across the packagingmaterial web) without affecting the performance of the machine. Thisadditional sealing system, which could replace one of the heat seals orbe an additional seal (allowing, for example, for reclosure after apermanent heat seal is broken), is introduced in the form of a tape (asdescribed in FIG. 2b ).

The current method of applying a functional system, such a closure orreclosure system, in a traverse direction, for example a plastic zipper,on a packaging machine involves applying the system from a spool onpackaging machine as shown FIG. 34. This process has a number ofdeficiencies which include the following:

1. As the spool of tape is laid across the packaging material, thepackaging material commonly stops moving as the spool is placed and thenheat sealed to the packaging material. This means that the machine isoften operating in an intermittent (not continuous) mode which meansthat the machine's output is considerably reduced (often by up to 20% orcall for an elaborate spooling scheme which adds complexity to thepackaging process if it is to be applied in a continuous process). Apreferred method of FFS packaging machines today is a continuoushigh-speed mode.2. Precise alignment of the spooled material on the packaging materialis difficult leading to variations in pitch (between subsequentplacements of spooled material) or registration, and this in turns leadsto scrap.

The present invention method addresses the above shortcomings, allowingfor the application of tape based functional systems across thepackaging material web at high speeds and in continuous operation.Further, the system can be readily integrated (retrofitted) ontoexisting packaging machines. Registration of the closure system isachieved through a timing system described in the following fourexamples. These four examples use the tape shown in FIG. 2b wherein thefunctional part of the tape is a modified PSA with the detack layer(232). This modified tape in contact with itself forms a seal that canbe readily opened and closed. In the examples that follow, a reclosurefunctionality is applied to a package. By changing the top surface of atape embodiment, differing functionalities can be added (such as amechanic closure system, a tamper-evident system, a cohesive closuresystem). Further in the four examples, use of an embodiment of inventionmethod using a VFFS machine is described. Note that the invention couldbe used on any machine that forms a web or sheet of material into apackage and is not limited to VFFS machines.

Example 1

In the first example (see FIG. 35) the functional tape is provided in aself-wound roll form. The tape is previously die cut to provide stripsof tape (see FIG. 36 for examples) that will subsequently be mountedonto the packaging material. The die cut functional tape is unwound andpulled through the process by the supporting liner which is rewound(along with any waste matrix) after the tape strips have been removed.The tape is indexed to a deflection plate (351) which deflects a tapestrip bringing into contact with the packaging material which is movingjust below the deflection area. During this process the liner takes asharp inward turn (354) which further helps to peel the strip. The tapestrip, with its adhesive side exposed, contacts the packaging material(352) to which it adheres and is therefore pulled off the linereffectively transferring the strip from the liner to the packagingmaterial. The packaging material travels forward through driven niprolls (353) which apply pressure ensuring that the tape strip isproperly adhered to the packaging material. The packaging material, withthe functional tape applied across it, now enters the packaging machineto be formed into a package. This process is repeated continuously withthe pitch of applied tape being controlled by the frequency with whichthe deflection plate pushes indexed strips across the gap to thepackaging web. It should be noted that this process relies on thefunctional surfaces of the tape having a reasonable affinity for theliner material carrying the tape. For example, this system works forfunctional material which includes cohesive and adhesives. However, forfunctional tapes in which functional surface would form a weak bond withthe liner a modification is required which is discussed below in thefollowing Example 2.

Example 2

In the second example (see FIG. 37) a system is considered in which theadhesive that will subsequently form the bond with the packagingmaterial is in contact with the liner in the starting self-wound roll.In this system, the functional tape has already been die cut into strips(361) (as shown in FIG. 36). The tape is unwound and pulled through theprocess by the supporting liner (362) which is rewound after the stripis removed. The tape is indexed to a deflection plate (371) which pushesa tape strip bringing into contact with a vacuum drum (372) locatedbelow the deflection area. Again, the liner takes a sharp turn (375)during this process helping to peel the strip. The tape strip, withfunctional side exposed to the drum is peeled off the liner and carriedforward by the rotating drum which accelerates to match the speed of thepackaging material. The strip contacts the packaging material (373),with the non-functional high adhesion side facing outwards, which pullsthe strip off the drum. The packaging material then travels forwardthrough driven nip rolls (374) which applies pressure ensuring that thetape strip is properly adhered to the packaging material. The packagingmaterial, with the functional tape now applied across it now enters thepackaging machinery to be formed into a package. In this operation goodresults are obtained by stopping the drum briefly at the moment at whicha strip is picked up and at the moment at which the strip is applied tothe packaging material. It is readily seen that in this process the tapestrip is effectively flipped so that functional side (such as velcro, azipper, a modified adhesive closure etc) which was not in contact withstarting liner is now face-up on the packaging material. This process isrepeated continuously with pitch of applied tape being controlled by thefrequency with which the deflection plate pushes indexed strips to thevacuum drum.

In the above two examples, the method relies on the tape strip beingpre-die cut (i.e in strips on the self-wound tape which is fed to thedescribed process). Subsequent to the above two examples, in FIG. 38 andFIG. 39, two complementary processes (to the two described above) areillustrated which require no pre-die cutting.

Example 3

In FIG. 38 the functional tape (not pre-die cut) is unwound (384) withthe liner stripped and fed to a rewind Stand (385). The tape, withoutthe liner, feeds into a cutting station (381) which cuts and mounts thestrip of tape (382) onto the packaging film (383). In this operation thepackaging film must stop moving during the cutting and mountingoperation. To ensure that the package machine can continue to operatecontinuously, a spooling system could be placed down-stream of themounting area so that the stopping and starting of the packaging filmweb would not affect the continuous operation of the machine. (Note thatif the packaging machine operated discontinuously then no spooling wouldbe required).

Example 4

FIG. 39 is an illustration of a system similar to that described aboveand illustrated in FIG. 37. A vacuum drum (391) is used to transfer cutstrips, with liner removed, to the continuously moving packaging web.However, in this system the strip is cut at the point of transfer (392)to the drum. Here tape material, in non-die cut form, is fed to the drumwhere it is cut and then picked up by the drum to be transferred to thepackaging web (393). The drum is briefly stationary during cutting andtransfer to the drum, and then accelerates to match the packaging filmspeed and stops briefly again during transfer. (Note that in someembodiments, the brief stopping of drum and subsequent acceleration maynot be necessary).

An example of how the functional tape, now mounted, on the packagingmachine travel through a VFFS machine is show in FIG. 40. In this casethe packaging film (401) is formed into a tube (402) with the functionaltape (403) running around an annulus of the tube (404). When the ends ofthe tube are collapsed the functional surface of the tape comes intocontact with itself forming a seal, and/or a reclosable seal or someother functional form (such as a tamper evident seal).

The examples described herein include strip of tape with material havingthe same length as the width of the packaging material or where thewidth of tape material is less than the full width of the packagingmaterial. The invention provides a continuous method of introducing atape-based functionality into and across (transverse direction) apackaging material as part of the process which converts the packagingmaterial into a package (405).

Another embodiment of invention is one where the self-wound pressuresensitive adhesive roll is die cut using a rotary die cut at thepackaging machine to form the die-cut closure tapes in the transversedirection on the packaging machine which is in turn dispensed on to theflexible packaging material either in a process described above or, by asecondary process where the tape is peeled (picked from) the releaseliner using a vacuum rotary drum and applied in register to the flexiblepackaging material.

In an embodiment of the invention, functional closure structures areapplied to packaging materials which allow the packaging materials to besubsequently formed into packages without meaningfully affecting theperformance of machines or requiring any significant retrofits to saidmachines. In another embodiment, printing or applying the closure systemto the packaging material on a press is performed prior to the materialbeing used on the packaging line. The packaging material is thensupplied to the packaging machine in standard roll form where it isunwound and assembled into the package (as shown for example in FIG. 1).In yet another embodiment, the application of the reclosure (or closure)structure to packaging materials which will have a typical multi-layerconstruction (as shown in FIG. 2b ) comprised of a PSA (which is incontact with the packaging material), a surface on the PSA whichprovides some desired functionality and (optionally) a release systemare done such that the PSA and the functional layer are printed (orotherwise deposited) on the inside of the packaging film which willsubsequently contact the food or other ingredient.

A release system may be required to prevent the PSA/functionallayer-sticking to the underside of the packaging material when thematerial is subsequently rolled up to go to the packaging machine. Thisoptional release is printed/coated/sprayed on the outside side of thefilm (which may have the product information printed on this layer) andis registered to the PSA which is printed/coated/sprayed on the insideof the film, which becomes the inside of the bag. Thus, when the film isrolled up the PSA/functional layer will be contact with the releaselayer which will print it sticking the other of the film. The PSA willtypically be printed on the packaging material in places where a closuresystem will be required (after the material is subsequently formed intoa package). The PSA can be a rubber elastomer based PSA or an acrylicPSA or any material that can be easily deposited at high speeds on apress using for example (but not limited to) a rotogravure/printingprocess, or a die or a spray process. The PSA can be further cured onpress if desired using for example radiation or heat. The functionalsurface will typically be a detack layer which may be printed, sprayedor otherwise deposited onto the PSA or be a part of the PSA blendedtherein. The detack material can be a non-tacky elastomer, or a fillermixed with an elastomer, and in general any material which has aslightly higher modulus (greater than 10⁶ dynes/cm²) than the modulus ofthe PSA rendering it non tacky to the touch on finger pressure and whichcan be printed, sprayed or otherwise deposited on the surface of thePSA. The release system (required where the layers have residualtackiness) is then printed or otherwise deposited on the top (i.e. otherside) layer of the film which may have the product information printedin cases where this package becomes the primary package such as in caseof potato chip bags or no print in cases where this bag has no printmatter such as in cases of cereal bag which goes in a box which has theprinted information. This structure is applied to the packaging materialon a standard press, or other suitable asset, to produce of a roll ofpackaging material with structures deposited throughout. Each of thethree elements are added in tandem on the same process at three (ormore) separate stations on the press. This roll of packaging materialwill subsequently be fed into a packaging machine and converted into apackage (such as, but not limited to, a bag or a pouch). An example ofthis shown in FIG. 4 where the prepared film is fed into VFFS. After thepackage is formed the functional structure is arranged so that thesurfaces of the structure can be bought into contact to form a closureof the package. This closure may be permanent (i.e. not allowingreclosure after breaking) or could form a reclosure allowing the packageto be repeatedly open and closed.

An example of the apparatus and method of an embodiment of the presentinvention is described here. In this example the packaging material willbe formed into a cereal bag which is about 8″ wide and about 10″ long ona VFFS machine. An embodiment of the invention allows to add a reclosurefeature to the top of the bag without any modification to the VFFSmachine. The packaging material is first prepared with our structure onthe press. A UV curable PSA is printed in a thin line (about 0.5″)across (about 16″ wide) the packaging material (transverse direction)every 10″ down the web of material. The PSA is applied at a standardstation and is cured at it moves to the next station. At this station,after the PSA has been cured, a detack layer is applied. The detacklayer can be sprayed on top of the PSA. The film then moves forward to athird station where an optional release layer is printed on the reverseof the film in register with the PSA/detack system. The film is thenwound up and is ready to feed directly into the VFFS packaging machineand be formed into package with the reclosure feature included. Notethat in one embodiment, the packaging materials are printed prior tobeing formed into a package and the addition of the reclosure system ofthe present invention is done during the process described in theexample.

Another embodiment of the invention is a tape which has a permanent,removable or an ultra-removable adhesive on the opposite of thedetackified surface. Yet another embodiment of the invention is asurface modified tape where the surface modification is on both sides ofthe tape. Such laminates are provided either in sheet form or tape formand are useful for a wide range of applications where temporaryfastening is needed for in-house or office or industrial applications.In another embodiment, an adhesive or adhesive tape is applied in theslitting process at the packaging material supplier.

FIG. 41 illustrates a pressure sensitive adhesive on a carrier substrateand whose surface has been modified with a detack material (411) and ison a tape dispenser (as shown) or is in sheet form. The other side (412)of the carrier substrate has either a permanent or a removable orultra-removable pressure-sensitive adhesive. Side 412 is optionallyprotected by a single sided liner (413) when in sheet form and adouble-sided liner while in self-wound tape form. The side 412 can beattached to any object leaving side 411 free to attach to a side 411 ofanother object (which has this laminate) to form a closure. One canenvision these applications being very wide ranging in nature such asfor closing file folder envelopes, storage bags, gift wraps, hospitalgowns, attachment surface to attach things onto surfaces likerefrigerator, walls etc. These applications can span consumer, medical,industrial, office and other market segments where two surfaces need tobe temporarily attached and detached. Presently these applications areserved by buttons, clasps, Velcro etc. which are more cumbersome andexpensive.

Another embodiment of the present invention is shown in FIG. 42 which isan illustration of a laminate having a detack layer on both sides and isin the form of a self-wound roll. The laminate can optionally have adouble-sided liner (421). Such a sheet or tape can be used for wrappingon itself to hold an object in place for applications such as wirewrapping, for holding catheters on arms or legs where presently othertypes of materials such as Velcro are used.

An embodiment of the present invention can also be used for temporaryclosure with no damage done to the underlying system. For example, forwrapping gifts using the system shown in FIG. 42. Not only is theclosure temporary (allowing easy opening) but the tape can be removedfrom the paper and the paper can be used again. This would be valuablefor scrapbooking and photo albums. These structures can be suppliedeither as die cut sheets of various lengths and widths to enable easyremoval and usage or as a tape which can be dispensed on a tapedispenser.

T Peel Measurements

The laminates were made by attaching the PSA layer 210 (such as S 246from Avery Dennison at 18 gsm coat weight) from FIG. 2 to the cereal bagor other bag material. The T peel values of the various tapemodifications were tested by bringing together the modified PSA surfaces232, laminating them, dwelling them for various times and then testingthe T peel using a Labthink XLB(B) Auto Tensile tester (LabthinkInstruments Co. Ltd.) using a separation speed to 300 mm/min. Typically,a half-inch width of the tape of the pressure sensitive adhesive withthe detack layer (or in some cases just the pressure sensitive adhesive)was attached to the other half of the tape, placed on a hard surface,and rolled back and forth once with a 2 kg rubber roller. The dwell timeafter lamination is typically 30 minutes unless otherwise specified inthe examples. The ends were delaminated and attached to the clamps of aLabThink XLB(B) Auto Tensile tester and separated at a speed of 300mm/min. An average of 3 to 5 specimens was tested, and the average TPeel data is reported in N/inch (N/in).

In examples where food stuff such as cereal, chips, or other contents ofa bag were used to test the adhesion of the adhesive after pouring thefood stuff across the adhesive surface, the following method was used:

The tape with the adhesive surface was attached to the side of acardboard jig having a 45 degree angle. The food stuff was poured acrossthe tape, and the method described in the previous paragraph wasemployed to evaluate T Peel. T Peel was measured after 1, 5, and 10closures.

Friction Test

A one inch sample of the laminate was laid down on a stationarystainless steel panel with the detack layer touching the stainless steelpanel. A 200 gram weight was placed on top of the tape, and the end ofthe tape was attached to a Fish Scale AdiyZ portable electronic scale.The digital scale was pulled at a constant speed of 3.85 feet/min. withthe tape moving across the stainless steel panel with the 200 gramweight on top of the tape. The frictional force of the detack/pressuresensitive adhesive layer moving across the stainless steel panel withthe 200 gram weight on the tape is recorded in pounds (lb). Swifttherm84659 and Advantra PHC 9200 yielded values of 0.18 and 0.3 lb.respectively.

Detack Surface Coverage Measurement

A digital photo of the detackified pressure sensitive adhesive surfacewas taken using an Ablegrid 2 Megapixel USB digital microscope. Theimage was analyzed using an ImageJ analyzer, which is an NIH free-ware.The surface coverage was recorded as a percentage of the total areacovered by the detack layer.

Detack Coat Weight Measurement

The coat weight of the detack layer on the pressure sensitive adhesivewas measured gravimetrically by first measuring the weight of a 2 inchby 2 inch area of the pressure sensitive adhesive with the film andsubtracting it from the total weight of the detack layer/pressuresensitive adhesive/film.

Width of the Filament

A digital photo of the detackified pressure sensitive adhesive was takenusing an Ablegrid 2 Megapixel USB digital microscope. The particle sizeand distribution of the spray coated samples was determined using ImageJsoftware. The filament width (with hot melt sprayed detack layer) wasmeasured directly from the image and averaged.

Example 1

A hot melt adhesive HL 8005 X from HB Fuller was printed using nylonmesh screens (Component Supply Company) with the following Food Gradeinks from Colorcon: FGN 5427 Black No Tox Direct contact printing ink,FGN 5474 Blue No Tox Direct contact printing ink, and FGN 5424 Yellow NoTox Direct contact printing ink. The following nylon mesh screens wereused: 52 microns (32% open area), 64 microns (47% open area), and 25microns (15% open area). FIGS. 8-11 shows several screen-printedsurfaces and the data on these surfaces is shown in Table 1.

TABLE 1 PSA Ink T T T coat Mesh coat Colorcon Peel, Peel, Peel, wt sizewt, Ink 30 mm 24 hr 7 days Example gsm μm gsm Type N/in N/in N/inControl 25 2.3  3   3.3 1.1.1 25 25 10.9 FGN 2    2.3 2.9 5427 1.1.2 2525 15.8 FGN 1.1  1   1.5 5427 1.1.3 25 52  6.2 FGN 1.3  1.8 5427 1.1.425 52 11   FGN 1.6  1.7 1.4 5427 1.1.5 25 64 15.5 FGN 1.1  1.1 2.2 54271.1.6 25 64 21.9 FGN 0.5  0.2 0.5 5427 1.1.7 45 25 12.9 FGN 1.9  1.9 1.85427 1.1.8 45 64 12.1 FGN 1.1  1.2 1.8 5427 1.1.9 25 64 18.9 FGN 0.9 0.6 0.6 5427 1.2   45 25 11   FGN 1.9  1.6 1.8 5427 1.2.1 45 64 24.8 FGN0.35 0.5 0.6 5427 1.2.2 45 64 19   FGN 0.6  0.3 0.4 5427 1.2.3 45 6426   FGN 0.2  0.2 0.2 5427

Example 2

The hot melt adhesive HL 8005X coated on 2 mil Mylar was sprayed with ahot melt elastomer, PHC 9200 from HB Fuller. The spraying was carriedout with a Nordson Universal spray nozzle system using low flowcontinuous signature, intermittent signature, and control coat nozzlesusing the VB 12 unit and using low flow gear pump pR6 ml (flow rate of0.83 g/cc per rev). The T Peel data of modified adhesive to adhesive onMylar is shown in Table 2. The surface coverage is the percentage of PSAsurface covered by the additive. The finger slide rating in Table 2 israted from 5 being non-tacky to touch to 1 being tacky to touch. Severalof the sprayed surfaces are shown in FIGS. 12-22.

TABLE 2 T PSA Pattern Peel coat Air Pattern Line Gun Pump Surface Finger30 wt Nozzle pressure Air speed height speed coverage slide mm Examplegsm Type (psi) Temp° F. (fpm) inch (rpm) (%) Rating N/in 2.1   15 LowFlow  8 275 200 3   3   16.3 4   0.15 Cont. Sig. 2.1.1 15 Low Flow  8275 150 3   3   20.2 4   0.4  Cont. Sig. 2.1.2 30 Low Flow  8 275 1753   3   15.4 4   0.7  Cont. Sig. 2.1.3 30 Low Flow  8 275 150 3   3  21   4   0.4  Cont. Sig. 2.1.4 45 Low Flow  8 275 200 3   3   19   4  0.8  Cont. Sig. 2.1.5 45 Low Flow  8 275 175 3   3   22.1 4   0.26 Cont.Sig. 2.1.6 45 Low Flow  8 275 150 3   3   29   3   0.14 Cont. Sig. 2.2  15 Intermittent 20 275 150 7.5 3   12.1 3   0.4  Sig. 2.2.1 15Intermittent  8 275 175 3   3.25 19.2 4   0.25 Sig. 2.2.2 30Intermittent  8 275 150 3   3.25 21.5 4   0.36 Sig. 2.2.3 30Intermittent  8 275 100 3   3.25 24   5   0.3  Sig. 2.2.4 30Intermittent  8 275 125 3   3.25 26.1 5   0.12 Sig. 2.2.5 45Intermittent  8 775 200 3   3.25 25.2 4   0.2  Sig. 2.2.6 45Intermittent  8 275 180 3   3.25 79.1 4   0.3  Sig. 2.2.7 45Intermittent  8 275 150 3   3.25 32.8 5   0.2  Sig. 2.3   30 Control 20275 100 2.5 3   19.1 0.4  coat 2.3.1 30 Control 20 275 120 2.5 3   22.50.3  coat 7.3.2 30 Control 20 775 150 2.5 3   28.7 0.6  coat 2.3.3 45Control 20 275  85 2.5 3   23.9 1   coat 2.3.4 45 Control 20 275  60 2.53   27   0.8  coat 2.3.5 45 Control 20 275  45 2.5 3   30.8 0.6  coat

Example 3

A hot melt PSA HL 8005X from HB Fuller was coated on a paper liner (fromChemsultants) at 40 gsm coat weight and laminated to 2 mil Mylar fromChemsultants. The liner was removed and CaCO₃ (IHubercal 150FG) fromHIuber Engineered Materials was sprinkled evenly onto the surface atvarious coat weights. This PSA surface was non-tacky to the touch and afinger could easily slide over it. Strips of this surface modified PSAbrought together and pressed with fingers formed a good seal and couldbe repeatedly opened and closed. The coat weight of CaCO₃ was 12.1 gsm,average particle diameter on surface was 42 μm and 30 min T Peel was3.75 N/inch.

Example 4

The hot melt adhesive HL 8005X coated on 2 mil Mylar was sprayed usingan air brush with the following Food Grade ink from Colorcon: FGN 5427Black No Tox Direct contact printing ink. Half inch strips of thesprayed PSA surfaces were brought together and rolled with a 2 kilogram(kg) roller, allowed to dwell for 30 minutes, 24 hours, and 8 days, andthe T Peel value was measured. Data is shown in Table 4.

TABLE 4 T T T PSA Ink Av Peel, peel, peel, coat coat Colorcon Inkparticle 30 24 8 PSA wt wt Ink coverage diameter mm hr days Example typegsm gsm Type % (μm) N/in N/in N/in 4.1 HL 25  7.3 FGN 10.60 36 3   4.24   8005X 5427 4.2 HL 25 10   FGN 12.4  38 2.4 4   4.6 8005X 5427 4.3 HL25 11.6 FGN 16.4  40 2.2 2   8005X 5427 4.4 HL 25 12.4 FGN 32.5  56 1.62.4 8005X 5427

Example 5

Three hot melt PSAs from Avery Dennison, FA20, R128, Z3000 coated on 1mil PET facestock were sprayed with Colorcon FGN 5427 Black ink atvarious coverages. The other side of PET was laminated to a transfertape of Avery Dennison Hammerlock adhesive coated at around 30 gsm. Thefree side of the Hammerlock adhesive was laminated to 2 mil high densitypolyethylene (HDPE) film. Half inch strips of the sprayed PSA surfaceswere brought together and rolled with a 2 kg roller, allowed to dwellfor 1 hour and tested in a T Peel configuration using the LabthinkXLB(B) tester at 300 mm/min. Data is shown in Table 5. Several of thesprayed surfaces are shown in FIGS. 23-27. As shown in FIGS. 23-37, thestandoffs may be provided in a random arrangement of non-regular shapes(e.g., non-regular dots, filaments or ellipsoids) wherein a fraction ofthe particles may overlap.

TABLE 5 PSA Ink Av T coat coat Colorcon Ink particle Peel, PSA wt, wt,Ink coverage diameter 1 hr, Example type gsm gsm Type % (μm) N/in 5.1  AD 30 0   3  FA20 5.1.1 AD 30 7.7 FGN 12.2  3.3 FA20 5427 5.1.2 AD 309.3 FGN 19.4  3.3 FA20 5427 5.1.3 AD 30 10  FGN 21.3  2.7 FA20 54275.2   ADR- 30 0    6.7 128 5.2.1 ADR- 30 7.8 FGN 14.6 39  4.2 128 54275.2.2 ADR- 30 9   FGN 19.3  3.8 128 5427 5.2.3 ADR- 30 9.8 FGN 24.6  2.6128 5427 5.3   ADZ- 30 0   10.5 3000 5.3.1 ADZ- 30 7.6 FGN 11.2  6.23000 5427 5.3.2 ADZ- 30 8.9 FGN 17.6  6.2 3000 5427 5.3.3 ADZ- 30 9.9FGN 24.3  3.6 3000 5427

Example 6

The hot melt adhesives of the examples coated on 1 mil Mylar at 30 gsmcoat weight were sprayed with detack layer on a Nordson VB 12 table topunit. The nozzle type was Continuous Signature Low flow, the pattern airtemperature was 275° F., the line speed was 275 feet per minute, the gunheight was 2.5 inches, and the pump type was PR6MI with a feed rate of0.93 g/revolution. The PSA types used were ADZ3000 (A), AD FA 20 (B), ADR128 (C), and Fuller8005 (D). The detack materials used were Fuller PHC9200 (E) and PHL 4157 (F). This laminate was used for T Peel testing. TPeel was measured after 1, 5, and 10 laminations. The results are shownin Table 6.

TABLE 6 PSA Pattern Detack Detack T peel after coat Air Pump coatsurface rectosures, Width of PSA Wt. pressure Speed Detack weightcoverage N/inch Friction the detack Example type gsm (psi) (rpm)Material gsm % 1 5 10 test, lb filament, μ Control 1 mil 0  None 0   0  0.11 Mylar, NoPSA 6.1  A 30 10 15 E 4.1 37.1 7.2 9   8.5 0.35  30-1206.2  A 10 10 20 E 5.2 41.3 4.9 4   4   0.42 25-95 6.3  A 30 12 15 E 5.750.7 4.1 4.7 5.7 0.56  20-120 6.4  A 30 12 10 E 2.5 46   5.8 7   8.36.5  A 30 10 25 E 7   44.4 2.3 3.1 3.3 0.36 6.6  A 30 14 10 E 2.9 52.78   7.4 8.2 0.78 6.7  A 30 14  6 E 43.9 5.8 7.5 8.5 1.11 15-50 6.8  B 3010 15 E 4.2 25.4 4.9 4.2 5.7 1.8  20-50 6.9  C 30 10 15 E 3.8 28.5 3.15.4 4.6 1.6  6.10 D 44 10 15 E 38.7 1.2 0.8 0.7 1.76 (transfer).* 6.11 A30 10 15 F 4.3 25.5 3.9 4.3 8   6.12 B 30 10 20 F 5.9 19.8 5.3 6.3 7.52.15 6.13 C 30 10 25 F 6.4 27.7 3.2 4.8 6.1 1.78 6.14 D 44 10 15 F 5.429.2 0.4 0   0   2.2  (transfer)* *Some of the &tack layer transferredto the SS panel

Example 7

T Peel data after a different number of reclosures was evaluated withand without cereal poured across the tape. Cheerios® were employed asthe cereal and in each case, 1 cup of cereal was poured across eachtime. Table 7 shows results of these tests.

TABLE 7 Finger slide raling before T peel after Detack PSA andrectosures, coat coat Detack after N/inch weight, wt, Surface reclo-Friction Ex. Sample 1 5 10 gsm gsm Coverage ¾ sures test, lb Control 1mil Mylar film 0.11 (Chemsultants) 7.1  Avery Z3000 11   9.2  8.73 30 1Too high, CNN* 7.2  Avery Z3000 + 5  2.53 0.82 30 Cheerios ® 7.3  FullerSwiftmelt 32   38   26   30 1 Too 82674 high, CNM* 7.4  Fuller Swiftmelt20   6.67 2.3  30 82674 + Cheerios ® 7.5  Fuller HL.28 I I 18.83 17.7 16.1  30 1 Too PW high, 7.6  Fuller HL.28 I I  8.67 4.1  1.73 30 PW +Checrios ® 7.7  Avery Z3000 11   9.2  8.73 30 1 Too high, CNM* 7.8 Avery 7.2  9   8.5  4.1  30 37.1 5 0.35 Z3000 + 9200 detack (Ex 6.1)7.9  Avery Z3000 + 5   2.53 0.82 30 Cheerios ® 7.10 Avery Z3000 + 92004.6  1.71 0.4  4.1  30 5 Detack (Ex 6.1) + Cheerios ® 7.11 Avery Z3000 +9200 6.2  3.93 0.85 2.94 30 52.7 5 Detack (Ex 6.6) + Cheerios ® 7.12Avery Z3000 + 9200 4.4  2.5  0.68 4.1  30 43.9 5 detack (Ex 6.7) +Cheerios ® 7.13 Avery FA20 4.13 4.3  4.63 30 Too high, CNM* 7.14 AveryFA20 + 3.9  2.13 0.53 30 Cheenos ® 7.15 Avery R128 3.6  2.8  2.4  30 1Too high, CNM* 7.16 Avery R128 + 9200 3.1  5.4  4.6  3.8  30 28.5 5 1.6 detack (Ex 6.9) 7.17 Avery R128 + 9200 2.4  1.37 0.86 30 detack (Ex6.9) + Cheerios ® 7.18 Fuller 8005 1.2  0.8  0.7  44 1 Too high, CNN*7.19 Fuller 8005 + 9200 0.24 0   0   44 detack (Ex 6.10) + Cheerios  ®*CNM = could not measure-PSA was sticking to the SS panel too stronglyand it was not possible to pull it along

In the case of the tape without the detack layer, the surface is verysticky and the cereal sticks to the tape. The cereal remained stuck tothe tape and had to be shaken off with the detack layer, the surface isslidable to the finger, and the cereal slid right off the surfacewithout sticking as illustrated by the high finger slide rating and lowfriction test. The surface of the 1 mil Mylar film against the stainlesssteel had a friction of 0.11 lb. Example 1 with Z3000 PSA with FullerPHC 9200 as the detack layer gave a friction of 0.35 lb. The Z3000adhesive without the detack layer had a friction that was too high tomeasure.

The T Peel values drop with the number of reclosures due tocontamination of the adhesive surface. The openings between detackfilaments or the features on the surface for getting the fingerslidability are chosen so that they are smaller than the cereal beingpoured across the tape surface. Some fine food particles that arepresent in the bag, however, may fall between the filaments or otherfeatures used for detackifying the surface, leading to a reduction in TPeel. The adhesive choice, amount of detack layer, the pattern, theoverall stiffness of the laminate, etc., are used to regulate the peelsuch that even after multiple pours across the tape surface, the tapestill retains adequate adhesion to tightly seal the bag contents. A TPeel after 10 such reclosures on the order of 0.4 N/in or higher isgenerally sufficient to tightly seal a package.

Example 8

Table 8 shows data from tests evaluating a metallized Mylar bag ofpotato chips (Lays®). Example 6.1 of Table 6 was used as the pressuresensitive adhesive/detack layer on 1 mil Mylar. The PSA/detack layer wasattached to the metallized bag using the S 246 transfer tape.

TABLE 8 T Peel after Detack Detack reclosures, coat PSA Surface N/inchweight, coat wt, Coverage, Friction Example 1 5 10 gsm gsm % test, lb8.1 1.9 1.7 0.6 4.1 30 37.1 0.35

Example 9

Two half inch by half inch strips of the tape of Example 6.1 were puttogether in such a way that the overlap area was 0.5 inches by 0.5inches. This laminate was placed on a hard surface and the overlappedarea was rolled up and down with a 2 kg rubber roller. After a 30-minutedwell time, the ends of the tape were placed in the jaws of the Labthinktester and separated at a speed of 300 mm/min. The dynamic shear valuewas measured to be 26 N/0.25 square inches.

What has been described above includes examples of the presentspecification. It is, of course, not possible to describe everyconceivable combination of components or methodologies for purposes ofdescribing the present specification, but one of ordinary skill in theart may recognize that many further combinations and permutations of thepresent specification are possible. Accordingly, the presentspecification is intended to embrace all such alterations, modificationsand variations that fall within the spirit and scope of the appendedclaims. Furthermore, to the extent that the term “includes” is used ineither the detailed description or the claims, such term is intended tobe inclusive in a manner similar to the term “comprising” as“comprising” is interpreted when employed as a transitional word in aclaim.

The foregoing description identifies various, non-limiting embodimentsof a tape closure system. Modifications may occur to those skilled inthe art and to those who may make and use the invention. The disclosedembodiments are merely for illustrative purposes and not intended tolimit the scope of the invention or the subject matter set forth in theclaims.

1. A method of applying a functional tape to a packaging material on apackaging machine, said functional tape being provided in a self-woundroll form and die cut to provide strips of the functional tape formounting on the packaging material, comprising: applying the strips ofthe functional tape to the packaging material either in transversedirection or in the machine direction; wherein the functional tapecomprises a first pressure sensitive adhesive layer having an upperadhesive surface and a plurality of standoffs of non-adhesive materials,the standoffs disposed in a random distribution on top of the upperadhesive surface, with at least two of the plurality of standoffspartially overlapping with one another; wherein the standoffs cover fromabout 5% to about 60% of the surface area of the adhesive surface; andwherein the standoffs comprise filaments and/or ellipsoids ofnon-adhesive materials, the filaments being of different lengths and/orthicknesses, the ellipsoids being of different diameters and/orthicknesses.
 2. The method of claim 1, wherein the functional tape iseither pre die cut to provide strips of the functional tape for mountingon the packaging material, or the strips of the functional tape are cutin line prior to applying to the packaging material.
 3. The method ofclaim 1, further comprising unwinding by pulling the functional tapethrough a packaging process using a supporting liner that is rewoundafter the strips of tape are removed.
 4. The method of claim 1, furthercomprising indexing the functional tape to a deflection plate thatdeflects the strip of the functional tape, thereby bringing it intocontact with the packaging material that is moving below the deflectionarea.
 5. The method of claim 1, further comprising exposing the adhesiveside of the strip of the functional tape, contacting and adhering theadhesive side of the strip of the functional tape with the packagingmaterial.
 6. The method of claim 5, further comprising pulling off asupporting liner and transferring the strip of the function tape to thepackaging material.
 7. The method of claim 6, further comprisingapplying pressure to the strip of the functional tape by passing thepackaging material through nip rolls, thereby ensuring that the strip isadhered to the packaging material and forming a package from thepackaging material in the packaging machine.
 8. The method of claim 3,further comprising the supporting liner taking an inward turn therebyhelping to peel the strip of the functional tape.
 9. The method of claim4, wherein the packaging process is repeated continuously with a pitchof the functional tape being controlled by a frequency with which thedeflection plate pushes an indexed strip of the functional tape across agap to a packaging web.
 10. The method of claim 1, further comprisingindexing the functional tape to a rotating vacuum drum that carries thestrip of the functional tape and brings it into contact with thepackaging material that is moving proximate to the rotating vacuum drum.11. The method of claim 1, wherein the functional tape has a T Peelvalue of from about 0.2 N/inch to about 20 N/inch.
 12. The method ofclaim 1, wherein the plurality of standoffs comprise sprayed materialsapplied onto the upper adhesive surface to provide randomizeddistribution of the standoffs on the upper adhesive surface.
 13. Themethod of claim 1, wherein the functional tape is die cut using a rotarydie cut.
 14. A method of forming a reclosure fastening system on apackaging material during printing of graphics on the packagingmaterial, comprising: printing a pressure-sensitive adhesive using aprinting press in a transverse direction on a first side of thepackaging material; spraying or printing a detack material on a topsurface of the pressure-sensitive adhesive; printing a release coatingon a second side of the packaging material registered with thepressure-sensitive adhesive whereby the release coating acts to releasethe detackified pressure-sensitive adhesive layer without blocking;wherein the upper detackfied surface of the pressure-sensitive adhesivehas a plurality of non-adhesive standoffs disposed in a randomdistribution on top of the upper adhesive surface, with at least two ofthe plurality of standoffs partially overlapping with one another;wherein the standoffs cover from about 5% to about 60% of the surfacearea of the adhesive surface; and wherein the standoffs comprisefilaments and/or ellipsoids of non-adhesive materials, the filamentsbeing of different lengths and/or thicknesses, the ellipsoids being ofdifferent diameters and/or thicknesses.
 15. The method of claim 14,wherein the reclosure fastening system has a T Peel value of from about0.2 N/inch to about 20 N/inch.
 16. The method of claim 14, wherein theplurality of standoffs comprising sprayed materials applied onto theupper adhesive surface to provide randomized distribution of thestandoffs on the upper adhesive surface.